I can write in both Sindarian and Quenyan Tengwar and I'm learning how to speak Quenyan from various websites and books.
http://www.uib.no/people/hnohf is a great site (i have no idea what the url is about but its called Ardalambion and it's really thorough) u can download courses from there and stuff. Oh yeah, i think u should get ur friends learning too, otherwise it will be very boring just talking to yourself or other ppl u don't know... oh i shouldn't be saying that in a forum... jk.