the dolomite lime is used to stabilize your ph of your soil at 6.5-7..add at 2 tablespoons per gallon of soil.
the miracle grow with coir is a fine soil had no problems with using it just add the lime and 25%perlite to your mix.
you can add blood meal for the veg cycle as it is high in nitrogen and bone meal is great for flowering as it is high in phosphorus.
most lowes or home depot sell fish emulsion a great veg fert,some also carry a fish emulsion that is high in phosphorus for bloom