Add custom fields to Wordpress RSS feed

I am developing a wordpress website and need some help. I have a few custom fields for my posts which do not appear in my rss feed. I am looking for someone to make changes to the code to include the custom fields. I can give you all the details and access to the wordpress administrator dashboard and ftp access. Looks easy enough but I have not played with area before and stuck for time to get into it. Please give us your best price for this small job. If all goes OK I may have some more tweaks to the site you can do. Many thanks David