Planning, need advice.

Been planning to build a tiny home since Feb of last year. I'm trying to work out the details of power. I'd really like to do solar/shore.

I guess I don't know exactly what information I'm looking for and if someone could point me in the right direction.

I have no experience in electrical. What I'm thinking will be the main power consumers is, a water heater, fridge, lighting. What I'm trying to figure out is other appliances and how much supply I actually need if I can't be on shore power.

I game, a lot. Gaming PC, Xbox1. Is this something that's even possible with solar power?