I think it'd be a nice thing to have,so where would a guitarist whose spent a year playing blues rock start learning how to do basic sweeps?
Have you got a teacher? They could help, but it's not essential. Maybe search Google and Youtube for some lessons on it, that would be another idea.
http://www.youtube.com/watch?v=xYB1oVjAO6s this video helped me loads with sweeping, it's 3 string stuff so it's pretty simple to start with.
Just use youtube. thats how i learned, it may seem difficult at first but trust me just practice and youll get it.