This is a prime site that has simple tutorials, u should all check it out its worth it cuz this site helped me alot with photoshop and i get pretty descent results now a days(though havent practised) so i say check dis site out all u people who wanna make siggys.
http://www.sigtutorials.com/
Hey and if u are looking for C4ds look no further register in this sites forum (http://www.sigtutorials.com/)
and go to this page
http://www.sigtutorials.com/forums/Sigtutorialscom-C4d-Resource-Pack-t3396.html
and download the c4d pack.
Good luck in ure sigs