Never turn anybody away even if you have plenty of volunteers, you will lose them for ever. Only give the individual a task that they can achieve and complete. Start small and keep going either every day or week or month, depending on your project. If only one turns up still go for it. If you don’t it is very hard to start all over again. Praise and thanks, have loads of sweets, drinks however cheap on hand to give out as you go.
Most importantly keep yourself motivated and enthusiastic, if your not enjoying it imagine your volunteers!