Your getting some great advice here. I would 2nd (3rd) the motion to first figure out how much power you need. If I had it to do over I would first get a minimum of the Trimetric 2024-RV
installed and go camping with a battery charger. You may want to driveway camp so you can charge up the battery every few hours as you learn real quick just how much power everything uses.
This was me. First thing will be converting the lights you actually need to LED and remove thoughts of AC, microwave, curling irons, etc from your mind.
Now that I've done it ass backwards and spent way too much money I'm have a lot of fun with this science project. You can to.
If you don't understand electricity your in for a surprise. Take a 100w light bulb. 100 watts divided by 120 volts is 0.83 amps. Now take that same light bulb and run it off an inverter. 100 divided by 12 is 8.3 amps. 8 amps continuous draw will drain a tiny group 24 RV/Marine battery in no time.