Hi Ashley, welcome to the family!
Sounds like you have made a pretty good choice that will blend with & enhance your lifestyle!
Electrical: I found someone whose job was RV repair, and experienced in RV electrical. There are unique aspects to our electrical needs & systems that a regular brick & mortar house don’t have. Finding someone to help with that aspect of my build was not easy, but knowing I didn’t want to do it myself & burn my beautiful home down, I set out to find someone who could do it. One thing you might run into, and it may vary from state to state: because my bus was a conversion, he couldn’t do the work on my bus. His insurance only allowed him to work on professionally/commercially built RV’s. He generously offered to verbally guide me through everything, and we spent several hours while he told me what to connect & where, explained what did What and how and why, and at the end of the day I had it all hooked up: two Fantastic Fans (fore & aft); refrigerator; kitchen lighting; 3 outlets in the kitchen, one behind the fridge, one at the front of the bus; the main control unit (set up to accept solar at a later date); and wired the outside hook up to the outside power source. He made sure everything matched up wattage/voltage/amperes/etc etc etc
Stuff I’m clueless about. So that’s the electrical route I took and recommend.
Plumbing: I kept mine simple. I don’t want leaks, because a leak will/could destroy your flooring and cause mildew in wood flooring beneath. So I have a kitchen sink. I don’t drive mine all over the continent, she’s a sitter that’s got the ability to go when needed. So I have an outdoor shower (summer months), with a self-composting toilet next to that, and in the process of adding a sauna. Everything can go with me/be rebuilt at a new location. I also have a gym membership that’s two miles away. It leaves more space inside as well.
I also had someone do my floor for me. I started, but realized the floor plan for the back of the bus would be tricky, and I’d never cut/laid floor before & was in a time crunch.
Anyway, good luck, look forward to seeing shots of your build!