REALLY new to this
You might also consider using a small inverter. Then you can use normal appliances. I''ve noticed many 12-volt appliances aren''t built that well. I''ve used 12-volt vacuums that could barely pick up anything. Now I use ''The Shark'' (great boat vacuum) on an inverter and it does a great job. My 4-cup coffee maker draws 600 watts, as does my vacuum. 600 watt inverters are pretty reasonably priced. It''s not hard to wire them into your 12-volt system.
Two things to keep in mind, first is to find the maximum draw of you most power hungry device, and then match it up with an inverter that will give you the power you need.
Second thing is your battery. Best to have two, one for house use and the other for the engine. We have three batteries, and a 2000 watt inverter. Using cabin lights, watching a movie a night and running the microwave we can usually go two days without having to re-charge.