Over time your compressor will change as your needs and equipment
grows. As a kid I could get by with a 1/2 hp paint sprayer
compressor. My first in my shop was 2 hp. Then came a 5, then 7.5,
and now 15hp IR T30 3 cyl, 2 stage unit. I run it off of a home made
rotary convertor too!

Good comments about piping and fittings. Do not forget drains an FLR
units where needed.

Bob