Sorry to be posting so much

We want to have a keg or two (or maybe even bottles to have more of a selection), wine, champagne and hard alcohol. The problem is I dont want to hire a bartender. Can I have hard alcohol with no bartender? Should i find a friend of a friend to man the station or let it be free. Or do i have to hire a bartender. Our families are all drinkers

I mean professionals. And most are Hard A drinkers. So getting rid of it would be the same as having a dry wedding. So what should i do.
Second I am not a big drinker so i know hardly anything about alcohol. So can I start buying bottles now and put them away until july. Or will they go bad? How about wine champagne or beer? How long in advance can I buy those?
Last I am not a wine drinker I couldnt even tell you a single name of one. Anyone want to help me out. Does any have some suggestions for a lower priced quality wine. Plus arent there different kinds?
oh boy I need help..
how much alcohol should I buy for 150 guest list?????