I'm now a guy with a compressor

When you mount the compressor to the floor make sure to use the rubber insulating blocks under the feet. It will quiet things down a lot & externd the life of the compressor. It's also mandatory for code in some areas.
It really doesn't matter if you leave it pressurized or not. No harm either way. If you let it bleed off you will just have to wait until it repressurizes next time you use it. Keep it drained of water periodically & that's about it. Go have fun!