Man you really need to listen to what these guys are telling you here.  Lawsuits are no laughing matter that's why I make darned sure that my models are mine and that every texture is my own before I sell or give anything away.  I know if it were me you took any content from you would receive a letter of cease and desist after that it would be up to you where we went next.  We spend many hours making models and creating textures, I'm sure you would not like it if you were ripped off in a similar fashion.  think about it before you sell or post a freebie, ask yourself. "Do I own all this content?" "Did I alone create this content?" "Do I have the permission to use this content in this manner?"  If you answered no to any of those questions then for your own good, don't submit it.  Do not get discouraged, get a good modeler and learn to build your own models, you will learn much.  These guys will not steer you wrong on here, it takes time to get good, it's taken me years to just now be able to start offering my models up to the public.