Hi, there are lots of pro-beginner designer at grabcad and the basic thing is draw and share. If you want to work with a group you can use workbench too. Just take a look then you will understand how it works(if you don't, you can send me pm). And there are some challenges, you can join them too, you can see lots of funny and creative design. And library, all designs are on that part you can download them and don't forget "like" them :D.