How much would it cost to fix up my truck?

I'm a 17 year old male and I'm getting my first car. It's a 1995 Ford F150 extended cab. I really like it and I've always wanted an older square Ford truck. I've always loved cars since I was little. I really wanted to restore something and this seems like a good opportunity. It's really rusty. Some places to notice rust are
-Behind driver and passenger doors
-Front fenders
-Bed (I plan to get a different one)

The wheels, paint, and interior are in great condition. It runs great. I want to do whatever work I can, myself. How much would it possibly cost to fix all the rust and paint where it's been repaired?

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