Angela,
Although the advice you have so far been given is stricly "correct", this sort of attitude will not guarantee you will not have to face a tribunal, before starting any new member of staff it is wise to follow these steps:
1. After deciding to offer the person a position, put the offer in writing, containing basic information about hours, pay etc and ensure that you explain that continued employment is subject to recieving satisfactory references, and the succesful completion of a 3 month probationary period.
2. Issue your new staff member with a legal contract of employment before they start their first shift, spend sometime with them going through it with them to ensure that they understand it, and answer any questions that they may have, have two copies of the contract, you sign both, as does your new staff member.
3. Ensure that you issue your new employee with the required, H & S information, Risk Assessments, Emergency Procedures etc, PPE etc.etc.
4. Give them copies of your training manual, employee handbook etc.
5. If your training consists of "on the job training" ensure that you actually complete the training programme, document this, and any short comings that need to be addressed, and realistic timescales for improvements to be made.
Only after all the above procedures have been followed, would I be 100% confident that I have complied with all the rules and regualations.
You also mentioned that your new staff member impressed you at interview stage, you should bear in mind that it is very easy to talk the talk, but much more difficult to walk the walk, references, or lack of, would give yet another clue to the actual abilities of any prospective new staff member.
Regards Rob