It will take your guppies 4 to 12 months to grow to salable size anyway. The most crucial time in a fish's life, especially when it comes to feeding, is the first two weeks of life. You might find it to your advantage to set up your guppies now and get a couple of batches started. OR you might want to research the project now, gather equipment over the winter and start in next spring. However, when I was a high school (history teacher) and we set up an aquarium club - at the request of a couple of great kids, I noticed that as the students became juniors, dating and jobs often became much greater priorities than an aquarium club. ;) That drove a lot of coaches crazy too, as a lot of pretty good athletes spent their next two years asking, “Do you want fries with that?”

You might find that you need two or four aquariums. Over and under stands saves space. 10-gallons are cheapest and ok. 20s are even better in that larger tanks (if you keep up your partial water changes) are more stable chemically and temperature-wise and your fish will probably grow faster. People showing guppies will often reserve as many as 10 tanks for one strain.

These are not what you are going to do. But they will give you some ideas.
See fish and fishrooms at:
http://www.ifga.org/guppy_store/gs_roebuck.htm
http://www.ifga.org/guppy_store/gs_schwab.htm
http://www.ifga.org/guppy_store/gs_shubel.htm
http://www.ifga.org/guppy_store/gs_white.htm
http://www.laurellakeguppies.com/
http://www.characin.com/home.html
http://www.alfanita.com/fishroom_e.htm

I would look for the best breeders I could find and, certainly for starters, would work with one strain. There are guppy clubs, some pretty good shops, Internet sellers (see especially the IFGA site and shop) and local aquarium societies which might all be the source of that special pair.

If you would give us the general region you live in, we might have some leads. Not trying to be too nosey or intrusive. For instance, I live in the Southern Suburbs of Chicagoland.

I found, when I was your age, that I could keep that many tanks of guppies happy. Had guppies earlier, but from about my junior year in high school through my undergraduate college years, I could "support" my hobby by selling light blue delta guppies, mollies and red swordtails to local shops, despite a pretty active social life. Sometimes the best I could do was swap them for canisters of food. Of course my parents or the places I lived at in college provided the space, electricity, water and heat which also were needed by the guppies. As an adult, by the time I add the cost for all of those things and the expense of an extra room for the fish into the equation, I'm not sure I was making that much "pure profit." But it was pretty cool as a teenager and is still fun. ;)

I think Megan has a really excellent point, that you will only want to save a batch or two of fry. One aquarium will be for your breeders, the other tanks will be for "grow out." When they begin to "sex out", you may find it to their advantage to move males to one tank and females to another.

Stan Shubel, in his Proper Care of Guppies, suggests saving the second and third or third and fourth drops of a female. She is healthiest then and the fry should be fine. If your parents drop more fry, just leave them with the folks in their tank. Some great ones may still grow up there anyway.

You want to become familiar with
setting up and cycling an aquarium,
properly equipping a couple of aquariums (get interchangeable parts and don't skimp on heaters),
seasoning water,
hatching baby brine shrimp (about the best food there is for baby fish, if they are big enough to eat newly hatch brine shrimp nauplii - and guppies are),
doing frequent water changes,
a few details of water chemistry,
"sexing guppies" or sorting them by gender
culling
establishing a sales strategy (finding shops, usually independents, who will buy guppies or at least trade for merchandise, NOT flooding the market and so on)

I would recommend reading the first several sections of the Guppylog Immediate Help links, the last couple of months of Guppylog and every book you can borrow from the library. See Breeding Livebearers "Walkthrough" in the Immediate Help section on Breeding for a list of useful books. If there is some kind of fish club near you, those can have incredible resource people.

My prejudice, but I think that Shubel's book is the best of the lot. Unfortunately it is out of print. It can be had through Inter-library loan.

Google can also be your friend. You will find stuff there using [Guppylog topic] which you will not find using the really awful search function here. If you ask the correct questions, Google will also give you a lot of other great leads.

And of course, please feel free to come back to Guppylog and ask questions and tell us how you are growing in the aquarist's craft. :)