reskin characters need help!!!

[battle111]

hello everyone!!!tomorow l'm planing to make a small project for battlefront 2 the project is "41th legion" this is a project that l have been planning all week and l'm very interested in reskining characters for battlefront 2 and also this will be my first mod for swbattlefront but the bad thing is that l don't known what tools l need to use and were l need start finding tutorials and some skinning tips will be nice to thank's please l realy need help l don't known what tools l need to use!!!!!!