Like Michika said, get some test kits, ammonia, nitrate, nitrite to start. If all three are at zero you are good to go. Never assume because things look ok, they are, especially at the beginning. I'd also try and figure out what you have for equipment, type of skimmer, what it's rated for. Lights as well.
Stay away from corals for at least 6 months as your tank stabilizes and starts to mature. During that time you can establish maintenance routines, understand testing and the effects of the above 3, then the big 3, calcium, magnessium and alkalinity and how they all relate.
Now fish, I have a 180 as well, I like my blue green chromis. Try 3 to start, they tend to school. Remember to only add 1-2 fish at a time and only once a week or so. This allows your tank to adjust to the additional bioload.
I love clowns, they don't require an anemone, your tank is too young for one anyway. Wrasses are bright, colorful, and can have unique personalities (I can pet one of mine). Some require sandbeds for sleeping, some are not reef safe. This is why you need to decide where you want your tank to go. Reef safe typically means corals and inverts (snails, crabs, shrimp). Yellow tangs add a nice pop of color.
Research your fish, if you see one in the store you like but not sure, go home, research it, then decide. Check live aquaria, the site offers good info on fish and their requirements.
Come up with a list of what you like and post it here. Hard to offer advice without knowing what you want. And some need to be added in a specific order to avoid aggression issues.
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