How to fix my porch, with no money?

Note: Porch is closed in so its more like an extra room..on the 2nd floor, and the only way to get to it is threw my room so my parents basically treat it as part of my room

Okay, so I have a porch that was leaking in the summer time.. I tore the ceiling down a bit and a bunch of stuff like, weeds and dirt, fell out of it. I fixed the leaks.. There is still a few holes on the top of the walls.. That lead right into my ceiling..A few birds have made nest there in the summer time..

I live with my parents and I have asked them for insulation but we don’t have much money.. It looks like crap, and I wanna be able to put some of my stuff in there because there is too much in my room. I thought about just stapling a blanket to the roof.. or perhaps some of the extra ply wood we have laying around.. But I don’t know how to fix where the birds are getting in… Any ideas?