Form I-864 Help please

[omardagame123 0]

So my fiancee recently got denied the visa and was told she had to mail in my 2013 taxes and I-864 for Joint sponsor. I had my mother co-sponsor since I am unemployed. We provided 2 I-134 with supporting documents but that wasnt enough. I was told that my mother needs to fill out form I-864 but its a bit confusing so I wanted to know if I can get help filling it out. Also, do I need to fill out form I-864 too or only my mother? Is form I-864a required. When she got denied, she was given a letter saying

To complete your application, you will need to submit original copies of the following document(s) through our courier:

2013 taxes for petitioner

I-864 for Joint Sponsor

I already got a verification letter for non filing from the IRS. I just want to know if only my mother needs to fill out form I-864 or do I have to also? And if form I-864a is required as well. I'm not sure what to check for part 1 and also, for part 2 do I put my fiancee's info? What do we check for part 3, yes or no? For part 4, is it my info or my mothers? Please and Thanks!