Short film budgeting

Hello

I'm looking to apply for funding to make an independent short animated film of roughly 5 minutes in the UK. I was wondering if anyone could give me some tips and advice on what I should include in a budget proposal form. Things I'm not sure about are how much I should pay myself, a producer (would only be a part time project for him/her) and composers. The music part is a big thing actually. How much would a composer normally charge for writing music for something like this? If anyone has any info or knows of any websites with this kind of info, I would really appreciate it.

thanks peeps!