Newb here! 1979 Celica ST questions!

Hi there, We are currently fixing up a 79 Celica St. We just recently replaced the starter to get it running again. Unfortunately while it sat for 3 months it molded on the inside because the seals on the car are pretty inefficient. I was able to catch it in time and kill it before the inside was completely ruined. Anyways...

Anybody have any experience replacing weather stripping through out? She leaks a lot in many areas. Especially the trunk which causes a lot of water damage problems. Any tips, personal experience or suggestions you might have would be great! Is it pretty difficult to replace? I'm having a hard time figuring out where to buy the weatherstripping that would be compatible with this car. Any help or insight is appreciated. smile