Being a loose tea lover, I can really appreciate this
As mentioned, if you can find them available it would be a very good idea to purchase an already well established bush then to grow your own from seed, although starting from scratch is always nice to see the entire life of your tea bush. The thing with growing from seed, as also mentioned, is that a bush must be so many years old before it can produce even somewhat decent leaves for tea making... Keep in mind that there are some trees in China reaching upwards of 1300 years old still producing tea, and these are the "ancient" trees that fetch the big money at market.
You can actually just search tea on wikipedia and they give by an extensive section of what the plant actually needs in terms of environment to survive, which really shouldnt be too hard to do.