The best thing I can suggest is either
- Local Accountants - let them know you're looking for work and offer your services
- Other Local Bookkeepers - offer to help them, perhaps offering your services free for a short time, to gain experience
- Go to your local bookkeepers meeting if you have one, to meet other bookkeepers that may be grateful for your help.
- jump in with both feet - start practising and go networking to gain some clients - you'll soon get experience then :-)