I have a personal blog, and I've learnt that people really aren't interested in hearing about your shop all day. You have to be a real person and blog about life, your problems, your excitement - anything that readers would find interesting about you, that's what a blog is afterall.
As for your shop, it's fine to mention it every now and then. If it's going well, or even going badly, you can use your blog to vent eloquently. If you're having a sale/coupon code, or you've just created and listed some fresh new items, that's a great time to create a post about it.
I get lots of views to my shop from my blog, and I do this by simply having a mini etsy box at the top of my sidebar. It's easily visable, so if people are interested, they can easily wander over.
www.ablackbirdsepiphany.co.uk
Hope this helps! This link might too:
http://www.thecuriouspug.com/2012/02/advice-for-bloggers-whats-worked-for-me.html