Last year I went on a course run by Music Network all about building a performance career in music. It was packed with information from a number of top people in the various areas looked at: web design, PR, seeking funding, planning tours, accounting and taxes, health, community and outreach work. I would thoroughly recommend it to anyone thinking of (or already with) a career in music performance. Music Network support musicians from many genres through their work, too, and I met classical, jazz, trad. and rock musicians on the week I did.
Cost for the five packed days is only €150, closing date for applications is 20 June and there are only 20 places.