i am glad i have inspired you to try sculpting. i use clay,bondo,foam and basicly anything i can get my hands on. i got into building props with my fett, then i could not buy a kashyyyk trooper costume so i sculpted one. it was my first complete build. not perfect by along shot but acceptable. i plan to redo parts of the kashyyyk trooper once i get the odst done.
the key thing is to take your time and not get fustrated. dali,michealagnlo and the like did not start out painting and sculpting masterpieces. they took a life time to master the skills they had. my stuff is getting better and i am trying to imporve my sculpting,molding and casting skills all the time. yes ,they are 3 different set of skills. as long as you are trying to improve with each piece you build. you will find sculpting very rewarding. i encourage you to look at other builders stuff to learn technique. i love the stuff nzjedi,evo, skygunbro,scifire guys and others have done and are doing. if you follow thier lead, you cannot go wrong.
remeber , if it is worth doing , it is worth doing right.