The main thing with marine tanks is not to rush it, ie it can take up to 6 weeks for the bio filters to start to work properly. you'll get highs and lows with the nitrate levels and you cant make it happen quicker than nature will allow . and dont go puting in a shit load of fish in one go or you will over load it. if you can do a 20lt drum water change once a week thats great but you could go 2 weeks.
Once you get the water right you can get live rocks from any good aquarium shop and build up your own reef.
what burb are you in?
cheers
wayne