hi, my best advice is to get a copy of the cobweb business opportunity profile (BOP) for each business.
it tells you all you need to know about a business, what the laws are in that area, what you should charge for your product or service, who your customers will be and how to find them, and much more...
you can see the contents of each BOP on the links below, however your local businesslink office should provide you with a copy free of charge http://www.businesslink.gov.uk/bdotg/action/directorylocal?r.s=sm
BOP's
Pet Grooming Service, updated Oct 07 - http://www.scavenger.net/product.php?productid=1836&cat=0&page=1
Letting Agent, updated May 07 - http://www.scavenger.net/product.php?productid=2021&cat=0&page=1
for other marketing ideas sign up to Chris Cardell's free email tips - he's very inspirational http://www.cardellmedia.co.uk/free.html
and get your business start-up stories on sites such as http://newbiztips.net/startupstories.aspx
best of luck with your business ventures
Rebecca x