bonjour Hugo,
the game you are planning to do sounds interesting..is it about a war?first person?3rd person?currently im working on a war game title too.
basically,to make your own independent game is time consuming.you need to do a lot of research and development(RND).modelling wise, try to make some basic model first
(lowpoly)..and you slowly progress you can enhanced you model with good textures.at the end,make sure it all compatible with your game engine.
good luck in your game effort.cheers.
