We have a Eagle shell which was completely bare except for the over wheel well storage boxes and the two small cabinets.
Inside
Over the last 3 years I've added a propex furnace, 2- 100 ampHr AGM batteries, 175 watts of solar, yakima rails and racks, a Dometic compressor refrigerator/freezer, some counter space, a one burner stove, CleanWaste Go anywhere toilet and various 12 volt outlets and USB ports. I consciously did not add a sink or dinette or table. We use folding cloth boxes from the container store for clothes, as and our "kitchen box". Food, misc stuff etc goes in the cabinets I built.
Outside
We have a swing away tailgate with a fold down table, which also carries a ten pound propane tank and 5 gallon water can, so I cook on the fold down table and we eat on either the picnic table or our TireTable using two 3 legged folding chairs. The Batwing awning covers our cooking and eating area. We have a battery operated portable sink to do dishes outside. If severe weather or bugs force us to cook inside we always carry simple one pot meals and use the burner, then eat off our laps, using the refrigerator as a seat and one of the 3 legged chairs.
It seems like lots of folks get a shell and then add a dinette or the Lagun table. I'm curious to know how much people use the dinette or Lagun table. We have toyed with the idea of a Lagun table many times, but always come back to, why would we be inside, when we can do everything outside. We do sometimes bring a small screen house for bugs, but rarely use it.
Anyway, since newbie is looking for some ideas I thought a discussion of "indoor camping" might be helpful.