What's a good place to get measured and everything? I was thinking of going to a place like Men's Warehouse just to get it done for free real quick.
Go to any tailor shop or even a dry cleaning business that does alterations.
Ask them to get suit measurements. Arm length, chest, waist, inseam are the bare minimum measurements.
A suit usually comes with a jacket and pants and the pant size is based on your chest size and the pants usually will not come hemmed. You'll have to go to a seamstress or tailor to hem the pants.
If there is no suit that matches your chest/waist combo (if you are either very muscular or just have a strange body shape), then get suit separates. This is when you buy the suit jacket and pants separately (and/or vest), but the fabric is the same.