The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
Don't-
Breed Pet Store Guppies
Breed without a market
Breed without a place for all fry
Expect to make much money
Put prices too high-you'll get maybe 30% of retail value from an LFS.
Cross lines
Do-
Breed selectively
Take time to find good breeding stock
Have an outlet for fry
Have at least 100 gallons worth of tanks
Have a proper filtration system
Look at ifga.org for some articles from guppy organizations. Best to start with 8-10 ten gallon tanks, no gravel, sponge filters. Be prepared to cull a lot when line breeding. If you don't have a LFS outlet, Craigslist may help you sell them.
Most papers charge, some very local ones are free, but IMO a newspaper is not specific enough to the aquarium community. You could check a local club, many of them have a few swap meets and auctions throughout the year.
I don't think I could use the auction idea because my guppies aren't worth enough to sell at auction I just thought I could put a tent up every first Saturday of the month and selling them for a. Few. Dollars