are you an AG brewer already?
If you're asking how to make yeast and how to make a lager, stout or ale I am betting the answer is NO. If you are seriously asking those Q's you are nowhere near ready to do a beer from scratch. First do a bit of research on the web and learn about mash brewing (www.howtobrew.com) then surf a bit more and research how to malt you own grain (www.byo.com had an article).
The closest you will get would be to:
1. grow some barley - try www.edenseeds.com.au, they sell barley although it wouldn't be barley used for beer, but really you wouldn't be able to get it close anyway so who cares right?
2. grow hops. Easy enough you're already doing that, although you wont know the Alpha Acid of them to predict your IBU's of your beer, but that's not important.
3. The closest you'll get to your own yeast would be to leave the fermenter open and try to get some wild yeast in there. I'd nearly garauntee that it will taste crap but you may get lucky and find a tasty mixture of wild yeast and whatever else is floating around the place (dirt, mozzies, dead flies etc) if you do, keep some yeast slurry and use it next time.
I would suggest reading a few books and surfing the net to learn as much as you can first. What you are proposing would take a huge amount of knowledge, skill, time, and organisation.