I'm filing a co-sponsor with my parents and I was wondering what sort of forms are best to gather to go with the affidavit of support. Any help will be appreciated, thank you!

You and your co-sponsor needs to fill out the form I-134. Including support documents for the methods used as support. With income, employer letter/tax returns, with assets include account statements. If income is suffcient, you do not need to mention assets or other types of support. But if you do mention it, you do need to include documentation.

Have a look here:
http://www.visajourney.com/faq/k1k2visa-application.html#4.1

Here for I-134 examples:
http://www.visajourney.com/forums/index.ph...p;page=examples

Thank you, everyone for your help