hi... Im a complete newbie to this site.
Tap Root is gonna head down no matter what... helping it along never hurts. germinating seeds love warmth and moisture... if your outdoor conditions are favorable then having them out could be better than in. If not than inside... you dont need any fancy lights or anything, its mostly the nights you need to worry about... cool temps slow down soil activity and could kill the newly cracked seeds. Put em out in the day then inside at night until the weather is favorable.
Ideally, a HID works best for starting the outdoor plants.
Some natural soil profiles can be great for growing ganj, however its risky and not recomended without prior testing and an idea about the soil makeup. Mainly a PH test... lime can buffer any minor ph swings... hmm. theres alot to soil and ganj... and tonnes of information availible with abit of searching...
My advice... think of your grandma's veggie garden(or whoever)... try and find a natural soil profile along those lines, get good sun exposure, and figure how to water. A cheap PH test kit will give you an idea of what your facing and the potential of the native soil.
Anyway... not to be a pessimist but putting seeds straight into the ground may not work out for you, but it never hurts to try... ime the more TLC you give and quality conditions, the better the results.
P.S. Searching the internet can be very enlightening
...doh! srry, just reread the part about buying topsoil... hehe. did I mention I was a newb?...