I sometimes make stupid money at this.
Sometimes it gets a bit upside down too!
I tend to buy 'sitter' that are at private homes and usually have one small problem that is too much for the current owner to handle.
Deals are still out there, but I have had to adjust my price thinking over the years.
My first fixer-upper was a 69 Shelby Mustang for $450 needed a starter in 1975. Latest was a 1995 Escort wagon with a destroyed motor...$450!!
I go through different types of cars as my knowledge grows.
had a run of Fox bodies Mustangs with bad 4 cylinder automatic transmissions. Found a junkyard with 8 5 speed cars that I got all needed parts from for $150 each. Then late 90's Ford 3.8 engines with head gasket problems. About $150 cash to fix those too!
90's Escorts have been a good deal for me as they are usually cheap and I have room to store the (3) parts cars.
If you do good work, the sales will be there! I give FULL disclosure on any car I flip and these folks often find come back for more.
I usually get a few cars ready to bolster my cash for swap meet season and it happily coincides with folks getting Income Tax returns.
Just used car money to get electricity in my big shop so I may step things up a notch after my vacation/swap meet at the Texas Motor Speedway this April 27-29th (come by..say HI!)
Know your flipping cars and keep an eye out for the fun stuff cause if it ain't fun...it just ain't fun!
I have the advantage of a big shop, no (big) bills, grown kids, lots of tools and a job that takes 20-30 hours of stress free time.
You spoke of cars with one small problem as the money makers. You listed head gaskets, transmissions and such. These can be good if you have a parts supply ready and available, but they can be hit or miss on the profit.
95 Escort with a bad motor was a deal because I had just bought 2 engines the week before! But it also needed an axle, brakes, trim paint and a severe cleaning. Aurora with a bad security key switch also needed 11 bulbs, wheel sensor, tune up, headlight, electrical work from hell, and a couple of junkyard trips for little plastic parts! Add the severe cleaning (leather is hard!) and it was not near as profitable or easy as the 91 Escort that needs a new timing belt!
Start with one car you know, list the stuff that needs fixing as you DD it and then sell it on for a profit! Treat it as a hobby until your confidence get up there a bit.
Bruce