NEW PROJECT: Questions about '72 C10

[Tattooed]

Just got a '72 C10 Fleetside Shortbed (Pics to Come), almost no rust, with a HOT 350 but this is my first project with a Chevy this old. So I have some questions, any help or advice is mucho appreciated.

1. Best place for parts online? (i.e. door panels, new gauge cluster, etc.)
2. I have a bench seat but would like to put in buckets, what would be a good fit without to much modification?
3. Best place for suspension parts?
4. I need some new carpet, how do you know it's a small hump or large hump? It's looks pretty small to me, but how do I know for sure before I order carpet.
5. If anyone knows a good custom shop around the Upstate of South Carolina it would be much appreciated. I am still fairly new up here and all the work I've had done in the past was in FL.

Thanks to everyone for any info.