Do you have a tank with any fish right now? If so, post your water parameters, tank's temperature, current inhabitants and the tank's size. Then it'll be easier to judge whether your tank's suitable for dwarfs or not.
Assuming you have a tank set up and cycled with compatible fish, dwarfs are lovely to look at and relatively peaceful but also very fragile. I would not reccomend them for someone just starting out. Depending on your tank's size, there are plenty of equaly (if not more) beautiful and peaceful gourami species which also happen to be far mroe hardy.
If you're still interested in dwarfs specificaly, you should first be aware that they preffer to spend their time near the upper layers in the tank. Being labyrinth fish, they rely primarily on air to breathe - they
can actualy drown if they don't have access to the surface. Like most gouramies, the males are territorial. I always suggest following a general rule of 10 gallons per male dwarf, 5 gallons per female. A minnimum over-all tank size would be 10 gallons for a single dwarf of either sex. Incidentaly, it's rare to come across females at your local fish store - they usualy preffer to stock the brightly colored males. That's not so bad, in my opinion (as long as you don't want to breed), as the males do very well kept singly and keeping them one-per-tank keeps aggression issues to a minnimum. A single male dwarf shouldn't be a nuissance to any of his tankmates but avoid keeping dwarfs with other gouramies that might prove mroe aggressive or fish like bettas (which are also gouramies actualy) with whichthey can, and do, fight and compete over space with. When it comes to compatible tankmates, most 'typical' community species are fine - platies, guppies, cory catfish, non-nippy tetras and barbs, the smaller rasboras and danios (though keep in mind that danios also rpeffer the upper layers so keep them together only if your tank is quite large).
You asked specificaly about any special care a dwarf gourami might need. I mentioned earlier that they are not the best beginner's fish. That's because they are highly susceptible to internal bacterial diseases - that's things like the dreaded dropsy and popeye but also ulcers and swim bladder disorders. The way I see it, the key to keeping them is, first and foremost, to pick one out that's healthy and, to avoid causing chaos in your healthy main tank, quarantining the fish BEFORE adding it to your tank. I strongly suggest at this point that you invest in some type of 'hospital tank' with a heater and filter. You don't need anything besides that and it shouldn't realy cost much. the tank itself can be one of those (food-safe) plastic storage boxes if you preffer and the filter and heater need not be anything high-tech or expensive - just enough to sustain a single fish for a month or so while you watch it carefuly to make sure it's healthy and treat it for any illness if necessary. Assuming you do have a cycled tank set up already, you can transfer a little bit of gravel and mature filter media from your established tank to the hospital/quarantine tank when you add the fish to get it instantly cycled.
While you're at it, buy yourself some anti fungus/finrot meds, melafix and a broad-spectrum antibiotic. Even if they aren't needed for the dwarf, you'll find having them handy useful in future
