first, as a newbie, you need to understand that you must learn to clone, that is the only way you will reap the full benefits of ganja growing. it's just too big a pain in the ass to raise them up from seed and wait 2 - 3 months for them to get mature enough to display sex.
with cloning, you know that every plant you flower is a girl!

second, let me say that i'm no expert so this is not meant to be definitive!
there are several ways to root clones and all are effective to one degree or another. just don't be discouraged, if you try something and it fails, try something else, then, it wasn't a failure, it was a learning experience!

personally, i've rooted clones in rockwool starter cubes under a dome (last year 95% rooted, this year 100% died).
i've rooted clones in just a glass of water, got about a 60% success rate (not good enough to rely on, and it takes a good 10 - 15 days to see roots)

i've only had one run so far with my new cloner but, in that run, 17 of 18 rooted and within 6 days! eureka!
(the cloner has been in operation for about a month now and still with about a 98% success rate)

anyway, since my aim is a never ending Sea Of Green, having a reliable source of healthy clones was a must. being a newbie myself, i set to work reading every thread on cloning i could find and this is what i've come up with, i hope it works as well for you as it has for me!