Welcome to aikido! :-D
whenever i lean foward on with my right arm foward when i go to roll my arm gives in and i faceplant the ground or the side of my back hits the mats,
You'll be glad to know this is a fairly common starting problem. I went through this, and it's not difficult to overcome. I second Chris Hein's post strongly; your ukemi is a level change, it is still mostly horizontal movement, not vertical. Your arm is there as a guide, not to rest your full weight on.