Yes, of course you can plant the seeds you find in your bag. Where do you think seed banks get their seeds from? From a BUD!

Sex is determined throughout the development in life. There are no male or female seeds. If you stress a plant out (eg. light leaks, fert burn), there is a good chance you will get a male plant (started from seed).

Male's produce no flowers (buds). Instead, they produce poooen sacks that contain no THC. Growing a male plant is next to pointless as you get so little, and wasting light life, exaust life, fan life, etc...on growing a male is silly. You start over and try again.

A female plant is what you want. They grow the floers (buds) that we all love and smoke. Take extra special care of your plant while growing with little to no stress, and your chances of getting a female increase. Keep in mind there is only a 50/50 chance of male and female, so I suggest starting more than 1 seed at a time.

Do some research on the basics of growing. It's really not that hard. All you need is the light times for the veg. or flowering stage, and what to feed them, and of course simple lighting to use, that's all really.

Start on one stage and move up to the next. Start with Germination of the seed, then when you have successfully finished that stage, then read about the veg stage, once you have finished that, then move onto the next, and so on.

Good luck.