So OP, I feel like I remember you saying in another thread that none of your friends smoke and you go to a tiny ass high school. My advice in that case would be
1) Don't...90% of the fun when you're high is just shooting the shit with your friends, it's nowhere near as much fun alone. Also having friends who have experience with you helps a ton
2) If you do get weed and definitely wanna smoke, just google up some ghetto shit. If you're feeling ambitious go for a grav bong or something, but if not try making a bong out of a water bottle, a pen, and something metal for the bowl. There are lots of tutorials on google.
3) Hide your shit...well. It's good to be somewhere that's convenient but at the same time an unknowing person would never find, e.g. the PS2 stash spot (again, google it).
4) For your first time make sure you've got time to do it at least twice...first time I smoked I didn't have the coughing up problem, I just didn't really feel anything. We went back an hour or 2 later and I got actually high. Then we went in again and I got really high
5) Do it outside, or somewhere where you can leave the window open all night (assuming you're doing it at night) to let it ventilate
6) If you plan on owning a piece or two and keeping that and weed in your house starting right now, you need to accept that the odds are easily 60% that you'll get caught by your parents before you move out.
7) If you go in paranoid, you will continue to be paranoid....like really badly paranoid. A couple weeks ago I knew I had like 5 hours until my parents got home but I had legitimately convinced myself that I was hearing them walk in and talk to my sister downstairs.
7) Whatever you do, DON'T be the "I'm SOOOO High" kid...no one likes that kid.
So do it if you're really interested; don't expect any huge enlightenment (although it has changed how I look at some things).
Also, to all the people in this thread saying "You'll end up lazy and dumb" you're over-generalizing: I personally feel really motivated when I'm high and I'd say overall it has actually helped me to become more motivated in general.