First, get yourself a set of spice measuring spoons, something down to 1/64 tsp.
I'd go with 1/8 tsp KNO3
1/32 tsp KH2PO4
1/32 tsp KSO4
1/32 tsp CSM+B
All 3x per week. That's recommended for a 10-20g tank, so you can dose a bit less if you want, but there's no harm in overdoing it.
To make it a bit easier, you can buy dosing bottles (I got mine from USPlastics.com) and mix solutions into two bottles (macros (white) in one bottle, and micros (brown) in another), and either mix one or two doses per ounce, and dose one or 1/2 ounce. With three CO2/EI tanks, I find that dosing with solutions is a little less messy and cut my dosing time per day from a whopping two minutes to a little under a minute
If you look, you'll find references to GH Booster, which many people use in place of K2SO4. GH Booster includes some K2SO4 as well as calcium, magnesium, and sometimes manganese and iron. The K, Ca, and Mg are the big ones. This may or may not be of use to you depending on your tapwater parameters.
Oh, and this is EI dosing, which assumes you're doing 50% water changes weekly. If that's not the case, you'll need to reduce the doses.