I tried to get into MTG back in 2010, but never got too far making my deck (I went Black Red) and had nobody to play with. Now I want to get back into the game (Playing Hearthstone made me want to try it again) so I want to improve on what I had.

Basically I've come up with this deck on the idea of 40% Creatures, 40% Land, 20% Spells. Is this the best ratio to operate on as a rule of thumb, and in the case of this type of deck?

Also, I've gone for 14 standard land, 10 non standard. Is that a good balance? Too much or too little in either direction?

Also probably need advice on the quantities of certain cards. Bit unsure about that...

Sidedeck:

Goblin Outlanders seem like they could be good to swap with the hellspark elementals if I'm playing a white deck. Don't know of anything else that would be good to have in there. Let me know!

Maybedeck:

I'm considering replacing the Blood Crypts with Temple Of Malice. The reason is that they're so expensive. I'm planning on buying all the cards I need from CardKingdom, and they're $13, which is a lot when you want 4... Not only is that the most expensive card in my deck, but it's a land. Seems a hell of a lot for land, at least relative to everything else I'm considering. I know it's considered a really good card but it's sooo expensive to buy. I'm open to suggestion for what the best choice of non standard lands would be.

Any advice would be greatly appreciate. Thanks!