Also look for the slots of people you know. Determine your relative position to them. Find someone in the base that you know. Determine your relative position. If you do not know anyone in the base, then find the name of the person you are directly behind and ask someone to introduce you to that person.
Chances are that someone else standing around the dive posting knows that person.
At the first dirt dive you will be able to be in your slot by looking at the base. Check your equipment and make sure you have everything you need. Arrange for extra weights, sleeves, altimeter, etc. This way you will not be scrambling around for these things when you need to gear up and go to the planes. Keep a handy supply of food and drink.