Charity shops, hit them up and buy yourself a good old fashioned manual SLR. Pentax MX, KX, K1000, Canon AE-1, anything nikon. Then load up with something nice, I like Kodak CN400BW. Go out and take some photos of your friends. Send the film off and get it processed. It is a liberating experience from the instant gratification of digital and the looking for errors in it straight away. If you blow it with film it is gone forever but so what?
If you haven’t, invest a little money in two flashes for off camera use and start playing. A pair of brollies and lightstands aren’t expensive