So I replaced the blower motor and when I put it back in, there is this gap where air escapes
Previous owner tried to hide this with tape and I found it, how would I go about fixing this?

 

Disconnect the big wire attaching to the alternator and making sure it's not touching ground in any way try to jump start it again. If it tries to start without blowing the fuse then the alternator is now blown.

 

So I replaced the alternator and now there is this squeal from the belt that gets louder and louder when I start the car

 

The belt is either worn, loose, or has oil/grease on it.
Verify it is tight enough, do not overtighten.
Verify there is no oil/grease on the belt, use some WD-40 on the belt to help remove the oil.

 

Ya I forgot to put the tensioner bolt back on the bottom of the alternator so I had to redo the whole process and now it doesn't squeak anymore.

Thank you both of you guys for helping me with my problems, i'm just starting to learn mechanics so im working on my car over time. Its cheaper then going to a mechanic.