You are plunging in too quick, do lots more reading on sea horse dedicated websites. They aren't easy, but a whole lot of research wont make them hard. Just make sure you research A LOT. I spent a good 9 months researching reef tanks before I went in, and still had a rocky start. Many here have had longer time to research certain things. If you really are serious at keeping them healthy, you are going to want to wait a few months before you actually get them, a few months researching and asking questions, a few months researching and buying necessary equipment, a few months researching while waiting until your tank is ready for life, and then maybe a few more months just in case.
<a href="http
/www.seahorse.com/" target="_blank">http
/www.seahorse.com/</a>
<a href="http
/reefkeeping.com/issues/2004-11/hcs3/index.php" target="_blank">http
/reefkeeping.com/issues/2004-11/hcs3/index.php</a>
Those can get you started on seahorses. And make sure you thoroughly read ALL of it, dont just skim and think you get the jist of it. And possibly join a seahorse forum and ask questions there as they can be of greater assistance. But still, keep us informed over here

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I really dont want to offend you in any way, but if you dont know how to cycle a tank I dont think you know enough about the care requirements of dwarf seahorses, I could be wrong though.
lastly, though you should learn this from reading, buy a captive raised/bred species!!! It will lessen the impact on nature and will prove to be easier to keep, and captive raised/bred are more likely to take frozen food, which will really make it much easier since feeding live foods a few times a day constantly can be a PITA.