Happy new year all and i hope someone can help me with my next step of the process!
My partner was granted permission to enter on a fiancee visa (the expensive one) which allowed us to get married

I am a British Citizen and my husband is American
We have been in a relationship now for 3 years before we married he lived in the states. He stayed with me for 6 months between november and april when he visited initally and then he was granted his permission to enter to marry me. He arrived on the 28th of october 2016 and we married on the 13th of December. He has been living with me the whole time - during his visit initally and then since he landed on his visa.
We are now planning to apply for the FLR (M) so that he can live with us in the uk. I was a little confused by one of the questions whereby it asked for 6 pieces of evidence that we live together.
After we married i informed all the agencies i need to of my name change and new status but the utility providers say that they only usually have one named account holder. I added my husband to my tennancy agreement too and we are awaiting a new copy of this to come through.
Im guessing to allow him to stay here we have to apply for the FLR (M) before his current visa runs out in april - but im not really sure i understand what kind of proof they are looking for us to be able to get. I see a lot about them wanting proof of living together for 2 years and i wanted to check if this correspondance part applied to me and my husband? Mostly because this is his first application for an extension? so do we still have to provide the proof of correspondance if we are only just married and starting our lives together? We obviously have wedding cards and congratulations cards that addressed to both of us here at my address but i dont know if im exactly sure this really applys to us.
I also have some general qwuestions about the rest of the form i was hoping to get some insight about if possible. It asks if this is the first time you have applied for a visa or extension of stay - so am i right in thinking we tick no for this because we applied for the fiance marriage visa before? or do we tick yes because its his first extension of a visa? i normally would have thought we would tick yes because this is his first extension application but is then says in the same question (2.2 flr (m) including previous leave granted as a fiancee. So im confused
also the question 4.7 about any mental health disorders ,im not sure why this is relevant to the application can anyone shed any light on why they ask this?