* The asterisks on the map denote the AT-TEs you have. They are mobile command posts that, while slow, pack quite a punch.
It is suggested that you spawn as the clone pilot first. But regardless of who you choose, spawn at the AT-TE (*) and immediately jump aboard and start driving. Walk towards the other side of the map from where you start, which happens to be around the Spire, a sought-after command post. Your secondary (though most important) objective is to destroy the Techno-Union transports at the rear of the map (1-3), and the most effective way to do that is with a tank. It may seem slow, but continue around the Spire. Once the first T-U ship is in range, give 'em everything you've got; don't hold back on the rockets, it's practically impossible to run out. Lather, rinse, repeat for the other 2.
Now the choice is yours. If you started as the pilot, you may want to stay in the AT-TE and bomb the mess out of enemy infantry; however, if you elected to spawn as a normal soldier, you have the option to get out of the tank and take command posts. It's all based on preference, really: nontheless, keep in mind that it's possible to rack up more than 90 kills in one game by taking the AT-TE out in front of the Spire and letting loose. Just be sure not to shoot your own units.