Buy $2 potting mix works just as good as mircle grow.

Pack soil firmly into a container that has drain holes, make holes with the end of a pencil about quarter of an inch deep, then place your seeds in, gravity will determine both the root and stems paths upwards/downwards so don't be to fussy about seed placement.

630 lumens.. hmm place plastic wrap over your container with seeds in it and place this under the lights to create a little humid glasshouse effect.

i doubt your lights will do that plant much good after 3 - 6 days of sprouting, the plants initial burst of energy is done by using its own energy provided, plants will need atleast 16000 lumens to grow any decent amount of smokeable material.

i suggest you look into buying some decent lights, or giving your plants natural sunlight, 600 lumens just won't cut it sorry.