keep it in your fridge, and try to find a sitter or at least someone to trip with you. now LSD can be pretty benign, but for some people it can really mess up their head, even from just one trip. its better to trip with someone else, especially for your first time. find someone who you feel comfortable with, someone you trust. find a good place to trip, where you wont have to deal with authority figures, where you feel comfortable.
a lot of people on this board like to trip alone, and do fine when they are. i dont think that its representative of how most people deal with acid trips though. from my experience, the vast majority of people prefer to trip with others, or at least have a sitter. i know i do, and i have dosed at least a hundred times. LSD will be fine in your fridge if its protected from light and air. it will be good for at least a year. be patient, you would be surprised at how serendipitous LSD and psychedelics really are.