Make a Tee Time, then Make the Tee Time

For most rounds of golf you play, you'll want to reserve a tee time. You can get a tee time by calling the golf course the day before (or several days prior, depending on a course's policy) you want to play and requesting a specific time.
Once your group has reserved a tee time, say, 10:14 a.m., it's really nice to actually make the tee time. Plan to get to the golf course at least 30 minutes early, just to be safe (many golfers arrive up to an hour early to warm up). If a tee time is missed, your group might lose its spot and have to wait around for another opening, which can take hours on a busy day. So while tee times are not always required, it's a good idea to have one.
And if you do get to the course early, spend the time wisely by hitting a few balls on the driving range, and putting on the practice putting green.

Choosing an Equipment according to your swing

Taking the right equipment to the course involves both rules and etiquette. The rules place a limit of 14 clubs in each golfer's bag. There is no minimum number of clubs you must have, but borrowing clubs from your partners is not a good idea. Borrowing clubs during a round is permissable under certain circumstances, but it is against the rules in most. So it's best for a beginner to simply make sure he or she has all the clubs they need, up to the maximum of 14.
Even if you're not playing strictly by the rules your first time out, you won't want to be badgering your playing partners to borrow equipment.
Make sure you have in your golf bag plenty of tees and, most importantly, plenty of golf balls. After all, if it's your first time out, you'll probably be losing a lot of balls! And take a ballmark repair tool with you (more on course care below). These are small tools that can be found for a couple bucks at most pro shops. You will need one to repair ballmarks on the greens.