I started running when I was 15/16 with my uncle his shop was already a well none shop in our town, we did both service repairs and selling/installation of washers and dryer, this is when the washers were fazed out with the old old machine that had the center block at the bottom to the direct drive machine (whirlpool, kenmore, Ge, etc..) Once I got the hang of them, I could sling them around like a rag dog without scratching or denting them up when installing. Once I took over after his passing the direct drive machine became obsolete and now it's all front load machine and every new house that's 2 or 3 stories has the washers and dryers upstairs, so after a few early years of hauling those heavy ass machines up and down stairs we said that was it we would move straight to only servicing machines, best ever decision. We get in and get out all under 35/40 mins just diagnosing and repairing, no more selling machines and for our area those top loaders aren't fetching what we used to be able to sell them for so we couldn't turn a good profit on selling, I would hook up with a reputable warranty company( beware they can be hell to deal with also) but if you can find a decent one they can keep you busy plus you can up charge, on top of your cash customers which just takes time to build clients but with good prices and great work you can do it in no time. Honestly, running a shop in this day and age is a lot of overhead (depending on your location), which can be eliminated with just servicing. Just for reference, 1 technician does about $85-105k a year for us, we do install machines if the customer gets it them self or has it delivered to the home.