Schedule: The Gators start spring practice at 3:48 p.m. ET today. Florida concludes spring practice with its annual Orange & Blue Debut spring game on April 11, inside Ben Hill Griffin Stadium.

What's new: Try just about everything. Florida had a major overhaul with its coaching staff after Will Muschamp was fired late in the 2014 football season. Only offensive line coach Mike Summers returns from last year's staff. Former Colorado State head coach Jim McElwain takes over as the Gators' head coach after three seasons with the Rams. Former Michigan offensive coordinator Doug Nussmeier takes over at the same position, and former Mississippi State defensive coordinator Geoff Collins will coach the Gators' defense. Other new coaches: Kirk Callahan (defensive backs), Kerry Dixon II (wide receivers), Greg Nord (tight ends/special teams), Chris Rumph (defensive line), Randy Shannon (linebackers/associate head coach), and Tim Skipper (running backs).

On the mend: Linebackers Antonio Morrison (knee) and Jarrad Davis, and offensive lineman Trip Thurman (shoulder) will miss all of spring practice. Defensive end Bryan Cox Jr. could also miss all of spring with a shoulder injury. Tight end Jake McGee will not participate in contact drills this spring as he continues to recover from breaking his lower leg on Sept. 6 against Eastern Michigan.

New faces: Florida only had two early enrollees this year: Tight end Daniel Imatorbhebhe and wide receiver Kalif Jackson.

Treon Harris will battle with redshirt freshman Will Grier for the starting quarterback job. Scott Donaldson/Icon Sportswire

Question marks: The Gators have plenty this spring. The biggest question is at quarterback, where sophomore Treon Harris, who took over as the starter last November, will battle with redshirt freshman Will Grier. Harris showed flashes as a playmaker last season, and provided the Gators with a much-needed spark on offense, but he never developed as a consistent passer. Grier was one of the top high school prospects last year, but had to add some weight. Florida is also incredibly thin along the offensive line, so losing Thurman, who is Florida's most experienced lineman, is a big hit. The Gators are also thin at linebacker and will be searching to find players at wide receiver, something this team hasn't had since 2009. Demarcus Robinson was one of the league's best receivers last season, but he has to be more consistent and needs help. Also, who is going to replace top pass-rusher Dante Fowler Jr.?

Key battle: It has to be quarterback. Florida hasn't had solid play at quarterback since Tim Tebow's final season in Gainesville in 2009. Since then, Florida has had only two individual 300-yard passing performances, and the Gators haven't averaged more than 185.7 passing yards per game in a season since 2009. Harris took over late in the year for embattled starter Jeff Driskel, who has since transferred to Louisiana Tech, and though Harris certainly got a little more juice out of the offense, Harris was never consistent enough throwing the ball (completed just 49 percent of his passes in 2014). He was a much better runner than passer, but that won't count for much in McElwain's more pro-style offense. Grier might be better suited for McElwain's offense, and some folks in Gainesville have been very impressed with his arm strength and quick release. Not playing last season is a disadvantage for Grier, but with a new offensive system being installed, both quarterbacks will start over fresh this spring. If the Gators don't get a handle on the quarterback position, it will be another long season for an offense that has struggled mightily the past five years.

Breaking out: Keep an eye on running back Adam Lane, who enters his third year at Florida with very limited in-game work. Lane hasn't exactly played much during his career, but his 109-yard performance as the lead back in Florida's bowl win against ECU showed some of the potential many fans were waiting for from the pint-sized bruiser. Lane averaged 6.8 yards per carry against the Pirates and scored a touchdown back in January. He's shiftier and a little faster than expected with his build, and he'll have every chance to take the starting job from junior Kelvin Taylor, who still has to battle consistency issues.

Don't forget about: McGee barely broke a sweat with the Gators in 2014, but with the NCAA granting him another year in Gainesville, McGee could provide Florida's offense with a solid safety net to help out this passing game. Though he won't take contact this spring, McGee, who transferred from Virginia last season, will work out and run around with the offense. Just getting him out there and comfortable with his quarterbacks is a major win for this offense. The Gators are in desperate need of another playmaker in the passing game, and McGee has the tools to be that person. In 36 games with Virginia, McGee caught 71 passes for 769 yards and seven touchdowns.

All eyes on: The offense. The Gators have some holes to fill on defense, but that side of the ball won't get near the attention that the offense will. Florida hasn't had much success at all on offense since 2009, and the Gators' highest offensive marks in the past five years came in 2014, when the team averaged 367.6 yards per game. At a school like Florida, that's totally unacceptable. The line is hurting, quarterback is up in the air, receivers must be found, and a new offensive scheme must be installed.