I think its pretty irresponsible people to suggest that this guy should go out and start buying sps for his first corals when we dont know anything whatsoever about his system. Based on the fact that you are inexperienced (Nothing wrong with that at all, we all started somewhere) here's a few point to think about..
Sps (small polyp stony), as a rule, require stable parameters.
calcium - 380-450
Alk - 7-9Dkh
Mag - 1350 - 1500
phosphates and nitrates close to 0.
Many will pick me up on these parameter guides as everyones has success with slightly different parameters. This is just a basic guide. Also there are other levels that require monitoring such as strontium, iodine and more, But we shall start with the basics..
For sps your system will need to be geared up correctly. Again im generalizing here but most sps requires strong lighting (i use 2x 250w metal halides over a 3x2x2), and good varied flow. At least 40x your displays total volume turned over per hour (the more the better i turnover 65 times, some more) Varied flow helps though. Also you will need to maintain a more stable temperature that softies and lps (large polyp stony) corals.
Easier or should i say, more forgiving corals to begin your adventure with may be soft and Lps. Most people start here as its good learning, keeping parameters and getting growth. Accidently spiking your alk in a softy tank will have little impact (depending on how big a spike obviously!!) though in a sps tank you could lose all your corals, or at least drop a lot of colour for a fair while.
All im trying to say is do a bit of research and decide what corals you like the look of, then weigh this up against the amount of time/money/and years of your life via stress your willing to donate to keep them.
Nobody wants to see you buy a heap of sps frags and loose then within a few days from inexperience, its would suck and wouldnt be a good experience for you to begin on. Coral keeping can be a fantastic interest/lifestyle and many people across the world, including myself will confirm the enjoyment you'll draw from this given you take your time go steady.
Good luck and if you need any help post it on the board in newbe's or fire me a pm and we will try our best to help you out!
Mark.