find someone to trip with your first time....
i would say eat like 2 hits....
as far as setting is concerned, try to do it in a place that you are fairly familiar with and enjoy....
nature trips are nice, but if you can i would try to trip around your home, going for walks and whatnot outside is great though....
i prefer night trips for acid, you can walk around at 3am and feel like your the only one for miles....
as far as pointing the trip in a good direction, don't try to control it or fight it in any way.... just let the lovin take hold, and go with whatever happens.....
Just keep in mind that no matter how crazy you might feel, when the sun comes up you will be back to "normal".... my first trip was absolutely wonderful, but at one point i felt insane, and could not even remember what sanity even really was... but i knew that whatever it was, it would be back by sunrise and i was ok with that....