Everyone has a place where they do their modeling and painting. Whether this is a specially dedicated room or just a corner of a table, you need a place to do stuff. There's just too much you need to model; it's hard to move around easily. To do this hobby you need:
-Something to put them in (a case, box, or foam tray)
-Primer (possibly multiple colors)
-Paints (takes lots of room if you do this right)
-Water source (dish, old tray, etc)
-Palate for mixing colors, and paper towel and newspaper for protection.
-Pin vise with drill bits
-Pinning materials (brass rod, paperclip, etc)
-Model glue (super glue, zap-a-gap, etc)
-Base glue (Elmers, PVA)
-Basing material (talus, flock, sand, etc. This is optional if you sculpt tiles on bases or use custom moulded bases)
-Tools such as jeweler's saw, clippers, dremel, etc.
-Varnish spray (Testors or go home, any other brand makes your minis look like frosted flakes)
...and all this stuff takes space. Back when I lived in Charlotte MI, I had a good system. I took a paper ream box and cut down the bottom part so it barely fit into the lid. Stuff goes in the box. The stuff I need goes on TOP under a piece of newspaper. The box goes on my lap, and I paint on my couch watching T.V. for background noise. This was pretty efficient, I got a lot done in Charlotte despite completing a teaching degree. Nowadays I just use the corner of a table and pile stuff in the corner.
But I'm working on it...