Yep they should have it, you may be better off seeing if they have a master test kit, usually includes Ammonia, Nitrite, Nitrate & PH, works out cheaper than buying them seperate.
These are the main ones you would use although there are others depending on how far you want to go/budget. I use these 4 and a phosphate test kit (this one because of my algae problem).
When first setup your tank (fish waste & excess food) will produce a lot of Ammonia, next it will produce Nitrite and finally Nitrate.
Ammonia and Nitrite are relatively toxic to fish and Nitrate is toxic in high concentrations.
One form of bacteria will change Ammonia to Nitrite, then another form of bacteria will change the Nitrite into Nitrate which live plants use or you dilute with water changes.
Basically it will take a few weeks for the tank to grow the bacteria and go through the stages of high Ammonia then high Nitrite then finally Nitrate.