I think I just put some stuff about why I wanted to do law, but looking back, it probably wasn't all that good, as I hadn't done any legal work experience then. I think I talked a bit about non-legal work experience and transferable skills, plus a bit about my other interests.
I know a couple of people who got sponsored by firms for their CPE, but only 1 person on my course had sponsorship. I got my TC just after starting the LPC and was lucky to get my CPE fees paid retrospectively, but don't bank on it.
There's info about some of the course providers on the Law Society website, but it's focussed on the LPC rather than the CPE - it might still provide some useful advice, though it doesn't have anything like league tables.