Most hobby builders use non toxic water based airbrush paint. There are many brands. Createx is a standard but you can mix/match among art and taxidermy brands. The alternative is lacquer based paint. Each has advantages/disadvantages. As far as epoxy for clearcoating, there are two main camps. Slow cure glue epoxies like Devcon Two Ton and decoupage/table top epoxies like Envirotex Lite (aka ETEX). Again, each has its advantages. There are numerous posts here about the popular epoxies, how to apply them, their different characteristics, etc. use the search feature to explore choices and techniques.
There are other clearcoats too: spray on urethane, moisture cured urethane, UV cured polyesters. Again, use SEARCH.