Welcome. Ricks are a tad on the expensive side.... Visually, the Retrovibe RV4 is a good start. Cheap-ish and good quality. Not sure if anyone has actually modded one on here to sound like a Rick.
Failing that, Rickenfakers come up from time to time on here and the 'bay.
There's a good thread somewhere here on Rickenfakers. Worth a read.
Nige