Learning Sylheti

[Intisaar]

Hi guys, my mate is pakistani (understands urdu) but he wants to learn sylheti. He's not bothered about knowing how to write it, he just wants to be able to speak it fluently. I've noticed alot of the nouns are similar between the two languages, but the grammer and sentence structure is different. Can you give me details of where he could buy books, tapes/cd-roms to learn sylheti or even take classes in London or in Chicago (since he's moving over there for a couple of years soon).
Hope you can help me, thanks!