Noob wanting to make a game

[sirtuftcat]

Ok heres my next questio.. before i start to crack into 3d modeling (which i have 0 exp in lol) is it better or reccommended to try to create all the map pieces and items and what not or make some and use some from som or maybe the better question is what do u all reccomend for customization tactics?
how much to create urself Vs how much to use from the already avaliable?

and where to start? map pieces first then items or ? hmm

Also reccomended 3d programs to use?