Prime Minister Malcolm Turnbull has discussed his new ministry, the election campaign, the NBN, Liberal Party donations and the same-sex marriage plebiscite in his first 7.30 interview since the Coalition won the election.

Here are some of the things we learned.

1. When will the same-sex marriage plebiscite be held?

The Prime Minister says the legislation to hold the plebiscite still needs to be passed by both houses, and the make-up of the Senate is not yet clear.

He told 7.30 "if it is not held in the latter half of this year… then it would be held early next year."

2. What lessons need to be learned from the campaign?

Mr Turnbull says he has formed government and "it's stable, it's committed" and he's not a pundit or pollster so it's not his job to analyse the campaign.

He says he wants to look forward, not backwards.

3. Is the Government going to tighten truth in advertising laws?

The Prime Minister says the Government is looking closely at "whole range of issues within the campaign" and Labor's Medicare campaign was an "outrageous falsehood".

4. Did the Prime Minister donate millions to his own election campaign?

Mr Turnbull says any donations would be disclosed in accordance with electoral laws but he would not say whether he did donate personal funds to the Liberal election campaign.

5. Is the Coalition prepared to compromise on its superannuation package?

The PM acknowledges some people are not happy with the package and says "there is always consultation and work on transitional and implementation issues" but the changes are fairer for self-employed and older Australians.