No I don't work in the field of immigration. I am not OISC-registered so cannot take on clients. However I have been a Moderator here for years, and I have more posts than any other member. Also back in 2001, without any guidance from this or any other Board, I got visas for my wife and step-daughter to join me in the UK, later got them ILR, and then British Citizenship. In other words, I have preceded you down the path you are now starting to go down.
To make the application you need to use
form VAF4 and it will also be worthwhile downloading the
guidance notes. Have a good read of those and that will give you an idea of the things to include in your "evidence folder".
Having read those documents if you have further queries, do post here.