Hi Ruthie
I have worked for my sister for 8 years, 5 days per week, my sister also employs our mum 2 and half days per week (she does our head in at times) but if you are close to your family members, you will find that they can be very loyal and they will only have your best interest at heart when it comes to your business. You can always set a trial period and minimal wage. Its so hard when you take on new staff as we know only to well, its been 12 years since my sister set up her business but this year we had 3 go on maternity, trying to find replacements was such a headache because you have to explain to the replacement that it is temporary as you have to keep their jobs open for a year. Websites such as HM Revenue & Customs: Home Page are really good for employment information. Also if you take on a student you can train them to do things the way you want things done, someone with years of experience could be set in their ways and may not be used to making funky wakky floral designs in keeping up with trends, but this would depend on wether you are looking for a florist or a shop assistant or you might need someone to do both.
Good luck in your search!!