That's great ^.^ Just wanted to make sure 'cause I've come across plenty of forums with people who are new and divided the tank, but they had the problem with it being see-through.. Anyway, usually the test that gets recommended the most frequently is the 'Master Test Kit'. It's liquid- which makes it more accurate and lasts longer than testing strips (therefore cheaper in the long run). From what I've seen they usually run around $30... but it is well worth the money! Since you've already moved your fish in, you'll more than likely want to get this kit as soon as possible so you'll be able to monitor the water levels and you'll be able to make sure that the cycle stuff you used is working the way it should....
What kind of heater was it? It'd probably be best to delve into some research on heaters as there are great brands, and there are really poop brands >.>;.... Also, it depends on what kind of heater you want and how much your willing to pay- as I've found that there are plenty of great heaters at cheap prices, but most of them don't last in the long run, but then there are slighty more expensive heaters that, while you have to put a little bit more money into them, they're great quality and will last much longer (you get what you paid for and then some, nor will you have to fret about your fish possibly getting sick while your running out to buy a new one). I'd say it'd be best to look into an adjustable one. You'll be able to get it at the right temperature you want it to be at and if your fish get sick, you'll be able to treat and adjust the temperature accordingly. The Theo Hydor is apparently a great brand to look into >.>
And moss balls are great! They're very easy to take care of. You need to make sure it gets low lighting (either indirect sunlight or at minimum 5,000k from a bulb. Preferably 6,500k), and rinse and squeeze at least once a week with regular tap water to make sure to get out the excess gas that builds up in the middle of them as well as getting rid of collected debris. Otherwise, just roll around in your palms ocassionally to get that rounded effect- or if you'd like you can rip them apart and tie it to a piece of drift wood or something and it'll grow on that! They grow very slow. As a plant, it does provide a bit of oxygen and gets rid of ammonia, but keep in mind that it grows slow (and your tank is pretty big) so don't rely on it like a filter unless you plan on having a heavily planted tank. If you do get one, make sure you quarantine it in tap water for at least a week- it helps to make sure there aren't any hitch hickers like snails or unwanted bacteria/diseases... Don't let the ones in the cup fool you, either! You never know where it came from, whether or not the employees that put them there quarantine them before putting them on display, and it's better to be safe than sorry.