I have no Idea where to start

I think I emailed a few times with the seller of your 68' Dart, if it was located in Oklahoma? Was the sellers name Ace? I eventually found the 68' I am working on in Montana. The guys are right, One thing at a time. I chose do my quarter panels first, which also included outer wheel tubs. Get a Welder, important, get one that will use a gas bottle (clean welds). My Harbor Freight welder has been fantastic for the last 3.5 years, I used it while doing my Duster restoration. It now will join up all the Darts new sheet metal. This is the one I bought, you'll have to get a bottle too. 170 Amp-DC, 240 Volt, MIG/Flux Cored Welder Of course you can always get a Miller or other very nice welders for more money, but I found this HF to be just fine and makes great welds.

Sometimes it helps to ask questions, sometimes it helps to get someone Live on the phone to go over something you are quite sure of. You will learn a ton, it will be frustrating at times but in the end you will have a very nice car. Make a plan, of what you want to do with the car, then go at it in steps, one thing at a time.

Alex