Is this your first time growing? I know the excitement of wanting to have a wide variety for your stash, so I'd focus on that well before you try your hand at crossing.
With roughly a 50/50 m/f ratio from regular seed, I'd pop 3 seeds each of 4 strains, for a total of 12 seeds. That will give you the best odds of getting a female for each strain without popping entire packs. Keep in mind that the market is flooded with F2 seeds created willy-nilly, so you may not find a plant that is as described.
At about a month in from seed, the plants should be ready to top. Create clones from the tops, and when they've rooted, plant them in your medium (I prefer soil) and wait a couple more days for them to recover from shock. At that point, I'd take one clone of each plant and put them into 12/12 in your tent, checking every day for pre-flowers. If you find a male, toss it along with the plant it came from. When you have all females, you will probably find you have more than 6 plants, so you'll either have to kill the rest off, or keep them in your veg area until the next grow.
It will likely take growing the plant out a few times before you can get it dialed in, which will give you time to hone the art of drying and curing the herb. Once you've got that down, you can tell which strains have your desired effect and start to think about making crosses.