You'll run into Sharina outside the hunting lodge on Tatooine. She'll spin a tale of woe, and explain that she needs you to sell a wraid plate that her husband found, since she's unable to do it herself due to the fact that she doesn't have a hunting license. You can, of course, simply take it from her for a Dark side shift, or buy it yourself (and turn a profit, once you get your own license), but the best Light side result is gained by offering to sell it for her, and giving her the complete amount of credits that you gain from the sale.
You're going to need a hunting license while you're on Tatooine anyway, so once you get one, return to the hunting lodge. Sell the wraid plate to the Ithorian for 500 credits, and return outside to talk to Sharina. You can either give her back 700 credits, 500 credits, or simply keep all of the money for yourself, with the appropriate alignment adjustments for each answer.
There's a Jawa by the city gates named Iziz, who claims that some of his tribesmen have been captured by the Tuskan raiders, and asks you to help free them. Free the Jawa prisoners from the Sand People Enclave, and return to Iziz for your reward.
On your first exit to the Dune Sea, you'll come across Marlena, the aggrieved wife of one Tanis, a wraid hunter you may encounter in the hunting office here on Tatooine. She'll make vague threats about killing Tanis, but the quest won't trigger--yet.
Later on, you may spot a few rapidly-moving figures in the distance while on the Dune Sea; this is probably Tanis and the battle droids he uses to hunt with. Marlena, it would appear, has a good repair skill, as she's rigged the droids to explode if Tanis leaves the perimeter that they've set up around him. Guess who gets to repair the explosive droids? That's right.
Actually, you can feel free to leave him if you want, but should you desire to get credit for the quest, you can repair the droids, no parts required. There are four droids in total, each with its own little logic or mathematical puzzle that you can use (in "manual repair" mode) to attempt to bring it back to its proper functioning.
K-X12A Droid: Node 2 is reporting correctly.
K-X12B Droid: The correct value is 7.
K-X12C Droid: Allocate 120 pulses.
K-X12D Droid: Select the third of the four sequences.
Tatooine Swoop Races
As you might expect, this is a fairly straightforward side quest; just keep racing and racing until you beat the best times in each of three tiers to receive a horde of racing bonds, which unfortunately are only useable on Tatooine.
You'll meet Nico in the swoop offices in Anchorhead; he and Motta have an uneasy relationship, due to Motta's attempts to pressure Nico into signing a contract that's financially weighted towards rewarding Motta for Nico's skills.
If you make nice with Nico, and prove your skills by actually winning the swoop racing championship (and thus completing the Tatooine Swoop Races side-quest), you will eventually be able to: talk Motta into giving Nico a bit more money, for a Light side result; convince Nico to sign the contract; or use your Force persuade skills to force Nico to sign. These latter two have obvious Dark side implications.
Worthy of History
This least essential of side quests involves not only finding a peaceful solution to the Sand People problem, but then bringing them the krayt dragon pearl after you destroy the beast. In order to open up this quest, you'll need to inquire with the Chieftain about his people's history after you bring him back the moisture vaporators; he'll ask you to retrieve the pearl, and after you do so, he will refer you to the tribe's storyteller, who will relate their fairly interesting history. You might want to save your game before handing over the pearl, just in case you don't think the reward is worth the cost.