I want to try marijuana one day, just to be able to say I've tried it and hated it lol...
My suggestion for first time smokers is to make sure you're doing something engaging lol. Watch something, listen to music, play games, make some art...etc. I don't recommend smoking and just sitting there. Be around good fun people.
First timers that I've seen that have smoked and just sat there usually end up having a bad time. They sit and get lost in their thoughts and just end up hating the feeling. Its obviously way much better when your mind is occupied having a good time instead of dwelling on the strange feeling of being high for the first time.
Also, have some snacks and drinks! You'll get the munchies but you'll enjoy eating way more!