I would suggest Fish emulsion since you are new to this.
It has very low levels of the 3 Basic Nutes, Nitro-Phosphorus- and K.
Alot of nutes are 30-10-10.
Fish emulsion is 5-1-1, use about one Teaspoon to every 1 Gallon of Water.
You can get this stuff at Lowes, homedepot ect ect.
Its made by 'Alaska' and its called 'Fish Emulsion' smells like rotten ass but it works.