I have to respectfully dis-agree with some of the above.
A master test kit is a good idea for a beginner. It should include pH,gH,kH,ammonia,nitrIte,nitrAte and possibly phosphate. You won't need the ammonia and nitrIte testers after the plants start to grow and balance is established, but buying a 'master kit' can/will save you money as opposed to buying them individually.
An Fe(iron) test kit is not necessary and I advise against wasting your money there. Likewise a K (potassium) kit. Both are difficult to use or interpret accurately, and just plain not worth wasting your money on unless you want to spend big bucks for a Lamotte or a Hach kit.
Fe is a micro nutrient and found in any good all-purpose trace element mix, like SeaChem's Flourish. All the basic micro's are in there in appropriate amounts.
Ideally, I suggest a clay based substrate like Flourite if you intent to get into a planted tank. It is relatively small in diameter, and loaded with Fe and also has the ability to hold nutrients for the plants.
If you don't want to spend the money for Flourite, at least check out a bag of it at your LFS just to see the size of the individual stones. IMO, they are just right for a planted tank.
Plants need auxiliary dosing when the fish can't supply enough for them by themselves. From the look of your fish load and with the idea that you only intend to plant a couple of plants, initially you many not need any extra nutrient dosing.
What is your current lighting situation? This will determine many things you may or may not need down the road.
Len