You are right that you need stabilizer - chlorine will be very quickly destroyed by the sun without it.

Ben wrote a fantastic startup guide for pools like yours, find it here: http://www.poolforum.com/pf2/showthread.php?17055-Super-simple-pool-chemistry-recipe-for-Intex-type-pools-start-up-amp-routine-care. I don't know what you've done so far, but reading through it should help. Reading through the stickies here, on the forum and reading through the material on PoolSolutions.com will help alot too.