The only equipment you'll need to be a litter picker is a constant supply of bin bags, and perhaps a pick-up-stick.
You could also offer your services to the owners of famous landmarks, such as churches and mansions. Picnic areas, many of which are owned by the local council, often become littered with sweet wrappers and sandwich packaging, ruining the scenery and deterring others.
Your local council may be interested in your litter picker services to help keep their highways clean, and you could approach local event organisers e.g. fêtes, pop concerts, outdoor theatres etc.