A well-organised collection should yield in the region of £50 per collector, and for a typical high street collection, you should try to recruit at least a dozen collectors.
This ought to give you a total income of £350 - £500.
You will also need to organise at least four or five well separated collection points or sites, and arrange a rota of collectors for each location. There are some very tough and determined people who can and will collect all day long but on the whole people can only manage an hour and a half or two hours at a time.
To swell the ranks of your own membership consider approaching your local branches of The Rotary Club, Round Table, scouts, cadets, or sixth form students on social studies courses for help.
Please note that it is illegal for people under 16 years old to collect, but they may accompany an adult who is collecting.
Finally, when recruiting you need to think of people who will help with the important task of clearing up after the collection and counting the money.
Remember, the golden rule for a successful collection is to plan, plan, plan!