Try searching AHR or At Home Reception.
This is just like planning a party. You need to decide how formal you want it to be and most importanly what the budget is.
I would still send invites 6-8 weeks before your date so your guests can plan to attend.
My AHR was pretty formal, much like a traditional wedding reception, so I wore my dress, we cut cake, danced, etc. Some of the other ladies have had less formal gatherings. It's all up to your personal taste.
As far as alcohol is concerend, you can possibly get a case discount from a local liquor store, but it's usually only about 10%. Be sure to check the store's return policy. Some will give you cash, others only store credit. Beer and sodas, if kept at a consistent temperature, can safely keep for 6 months or more. You could start buying cases when they are on sale and store them.
I'm a caterer/event planner so if you need more help, feel free to ask!