Blogger and Wordpress seem to be the two most popular blogging sites to use. Blogger is one I've used for a bit over two years and is really easy to use. Wordpress is apparently better for customisation (but I don't know that from first hand experience).
You can also link in your blog to Facebook so that when you write an entry, it comes up as a 'note' on Facebook (in case you want to do that).
I don't have any particular advice, but it is really useful for remembering what you were doing - and my parents overseas love it for staying in touch for the day-to-day things, with photographs.
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