Don't go through Reed. Most colleges run accounting and book-keeping courses, you can do GCSE, A-level, City & Guilds or AAT. Some colleges do courses on how to use Sage, which is one of the main accounts packages. I dare say most colleges can run courses like that online at the moment.
Before you do a course, buy this book and read it from cover to cover. You can get second-hand ones very cheaply on Ebay or elsewhere. It explains all the basic principles step by step, a chapter at a time:
Business Accounting Vol 1 by Frank Wood.