There is a basic template available which was made by one of our members, which can be found in this thread here
This is a first person game that is currently being developed using the Visionaire Studio engine @ here
There are a few members on here that focus on first person adventure games & they would be the best people to ask about how to start making them. They are known on here as: Nigec, Millenium2k & Simon_ASA.
This thread here
that Simon wrote has lots of useful information such as: his working process, from ideas, to how he created the artwork, to piecing it together in Visionaire Studio. I believe there's also a little tutorial on how he did some of the stuff for his upcoming game with Visionaire Studio from about page 3 onwards.
Hopefully this will be enough stuff to get started. Also there's currently a competition underway at the minute & hopefully there will be some first person game entries (templates) which will be available to download via the wiki once uploaded/shared to us.