Hello Mr. Kephas,
If you would like to become a CB (Certified Bookkeeper), I recommend you check out the certification program offered by the American Institute of Professional Bookkeepers (AIPB). You must obtain 2 years of experience working as a bookkeeper and you need to pass a 4 part certification exam. To my knowledge, you can complete the exam and then obtain the work experience later on if you don’t have it.
For more information about the program, check out the How to Become A Certified Bookkeeper article.
Best of luck to you,