Seems like you're all set to begin, kenijaru!
I suppose that little app from Adobe is up to the task but it's no MS Paint. :p
Wings3D is a favorite here for those who can't or won't pay for the application used by the Ubi SH3 devs, 3DSMax.
Blender 3D is another free choice and has far more features than Wings 3D. It's comparable to Maya, mainly tuned toward animation, but it also renders static models very well. Too many plug-ins to list here.
Good luck on your prospective SH3 modding career! You will become part of that rare breed who brings us all a better gaming experience.
Your reward will be whining, moaning, nit-picking, and endless opinions on how it could be better.
But you'll also have many that will appreciate your work and encourage you for more, if you can put up with the rest.
Looking forward to your first official release!