If you are unfamiliar with a single or twin engine powerboat, reward yourself and hire a boat handling instructor. A good instructor will go over your mechanical, electrical and electronics with you describing their function and maintenance requirements in addition to making you a good boat driver. They will also give you some pointers in case of failure of the more critical systems.
Make sure the trainer is a USCG licensed captain - ask to see the license. Check with your insurance broker for recommendations and if you will qualify for a lower rate after the training. Contact previous clients to verify the captains instructing proficiency and demeanor. There are many USCG licensed captains. Most are in the commercial sector. Not many captains have the communication skills, knowledge, patience and pleasure boating experience to train a novice boater.
Expect to spend a minimum of 8 hours (hopefully not in one session) actually behind the wheel practicing docking and other maneuvers. Ideally the mornings are spent docking when the wind is light and the afternoon is devoted to going over the boats systems, handling emergencies and other "book learning". 16 hous total training is typical, 10 to 12 hours practicing handling and 4 to 6 on systems depending on the boat owners proficiency and the complexity of the boat. Avoid the instructors that have the same preplanned program for all clients irregardless of the clients experience or boat.
Do not use the excuse that training is too expensive. Which is what I hear from many boaters. They are buying a boat, they have no problem spending thousands on electronics, dinghy, canvas and other frills immediately after buying the boat, but refuse to spend money on becoming a better boat driver. I'm not sure why boat handling instruction is resisted when people have no aversion to taking flying lessons, golf lessons, performance car driving school and others
Then they embarrass themselves docking poorly or experience railing benders. Eventually the insurance claims pile up and premiums rise. Boat owner gets frustrated or wife refuses to be on boat and the boat owner becomes a RV owner or worse.
Also take the USCG or Power Squadron courses.