If you wish to have your own domain and stuff, WordPress is the way to go. If you want to "get your feet wet", Blogger is a good option. Or LiveJournal.
It might help to start with a Blogger, at least while you find your niche.
As for finding what to write about, find your interests, if you like knitting, write about that. It's just like building an "ordinary" website.
You can also start a personal blog, write about your life, your business, mitts you made while knitting 
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