Black Jungle (he lives close to) has the ready to go fly cultures (already producing) and cultures just started if you have flies and need cultures to start producing leter on. I buy the British Gliders from them but he will have several choices and they will recommend what flies to get. They will also set you up with their culture media and excelsior, and cup and lids. Figure you'll spend 35 bucks for every thing to make about 20 cultures.
They will also walk you through making the cultures. Takes about 5 minutes to make two or three cultures using their mix.
Try to keep your cultures between 72 and 76 degrees so the media does not melt down and so the flies keep producing.
I use both Black Jungle's and Josh's Media and like both. If you go with Black Jungles media then you will need a packet of active yeast which you buy at the grocery store. If you buy Josh's media and Josh's flies then you don't need the yeast.
Like I said, drive over to BJ and have them show you, they are great to deal with and always helpful. They also have some of the most amazing plants :-)