We charge book time to install struts. I can't justify a flat price when some take 20 mins and some 3-4 hours. We do quick struts or other brands complete units, it's better for the customer. In the rust belt 99% of the time the strut mounts and springs are shot anyway.
Don't sell junk. I sell about 60 - 100 cars a year, it helps pay the bills. If anyone tells you selling cars isn't a full time job they are dreaming. I put my service customers first, you really have to be careful because the used cars can suck up all your time.
I recommend coming up with a plan of attack, and stick to it. If you sell junk you will end up fixing junk for junk clients. I try to mix it up, I have some low end cars and keep a couple higher priced models. The $2500-$8000 price range works for me. Less than $2500 doesn't leave room for repairs, over $8000 and its too close to the big dealers with their financing bs I can't compete with. You need to know your market, in my area pickup trucks and 6-7 passenger SUV's sell instantly. Minivans are hit and miss. I happen to collect w210 Mercedes so I always have a couple for sale, but they are a niche car. If I inadvertently buy junk I wholesale it. win lose or draw it disappears asap.
Pros: you can make some real money and you always have extra cars to drive. Auctions are fun. It keeps the mechanics busy. A full lot generates more business. Instant cash infusion when one sells.
Cons: time consuming, you can lose $$$$ easily, you can ruin your reputation FAST If you sell junk. Paperwork can be tedious. Full lot means nowhere to park. Many new friends will want to borrow your dealer plates. Less profit than expected.
Last thing, once you get your dealer license the state will make sure your paperwork is in order. Most used car dealers are assumed to be liars, cheats, and scum bags and the state knows it. Do it right. Don't sell junk. If you have questions feel free to ask.
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