Most micros are supplied in your tap water. You can find out what micros are present by contacting your water supplier for their test results.
Macros are far easier, they include Potassium, Nitrate and Phosphates. You will probably get a healthy amount of phosphates via the food you feed your fish. A phosphate test is a good idea, since you will want to maintain 1.0ppm at all times. There is no method of testing potassium. Since it doesn't replenish itself in the aquarium, dosing is necessary, usually 1-2ppm daily or every two or three days. Nitrate can be tested via nitrate test kits. You want to maintain 10ppm at minimum and dosing if you bottom out is also needed. You will definitely need the nitrate/potassium combo, trust me. Gregwatson is great for this one, it's a dry KNO3 that you can mix into a liquid solution that will outlast the Flourish products.