Dave, go for it, write your blog.
Blogs can be and often are useful sources of information for many people and a great way of sharing your findings, adventures and thoughts.
As a former hill and moorland walker in the UK, I kept a blog, and many of the places I've been to are still online ready to read by any one. I've had a few comments and requests for information, and I've been happy to share my knowledge with those not so sure.
I noticed a couple of people use Google Blogger, as do I, and if you want to peruse, have a look at "Peak Rambler's Ramblings...." please do, though due to a major change in my life four years ago, I've not really done much of any note.
There are many ways in which you can share your blog, Google Blogger is one, Word Press is another, and though I have looked any deeper, I know there are many more formats out there, or, if you or someone you know is good at creating webpages, then make your own custom blog.
When you do start your blog, be your self, there is no need to mimic anyone. However, as you create more (loosely using the word) stories, you will develop your own style of writing and posting of photos.
There is no harm in being a chatty while sticking to the topic of discussion, after all, we often digress from the main subject during normal chatting, then resume the main subject.
One piece of advice I will give, if you do start a blog, opt for moderating comments, you'll be surprised how many use your blog to share unsolicited websites and sell. That way you can display the legitimate comments that all can enjoy reading.
Give it a go and let us know your first blog, and enjoy it, that way you'll be creative.
Mike
Flickr Peak Rambler