Just do it.
Good ideas here for a table in garage. So much of how you do it depends on where you live.
I live in Alaska and years ago I built a 28x36 foot garage. It has a roofed breeze way between it and the house which gives us about a 12x16 foot covered area for what ever.
Any way, the garage has insulated 2x6 walls, a ten foot ceiling with sprayed in insulation in the attic. A concrete floor with in floor heating. In floor heating is the best heating I have ever lived in.
The 9' pool table sits in the back of the garage with a minimum of 5.5 feet to the nearest wall. I laid cheap Home Depot. 2x2 foot carpet squares around the table and used some vertical fishing pole holders for cue holders, works great.
The nice thing about being in the garage is I do not disturb my wife when buddies come over to play. She can't hear us, which is good. I have and air filter fan that runs in there as a couple of them smoke and I like a cigar during a long session. Bose music box and some pool decorations, courteous of my wife.
If I had it to do over I would of put a loft and bath room in it. Save me money from buying a cab for friends. LOL
Any way, a big garage has room for a 9' table and two vehicles. It is my "man cave" and a fun zone for me to enjoy retirement in during our long winters.