go to www.google.com, or www.yahoo.com or any other search engine place your cursor in the search box, hold down the shift key and press the 2 key on your keyboard, type in your phrase then again hold a shift key and press "2".
the search box should look like:
"Phrase Here"
Now press the enter (return) key or click the search button with your mouse.
I like to use Google Adwords free keyword search tool which gives you a whole bunch of keywords and phrases plus displays the number of global search per month for each keyword and phrase so you get a good idea of their popularity.
As to starting up a new blog with Blogger. Please visit my Blogger help blog Blog Know How and Blogspot Blogger Guide which are both written with the beginner blogger using Blogspot in mind. I have written a huge range of tutorials about customizing Blogger such as SEO, feeds, social bookmarking, gadgets, widgets, building site traffic, tracking visitors and more. Simple clear instructions.
Also if you are in the market for a free Blogger template to customize your blog further please check out my Top Free Blogger Templates blog for a handpicked selection of top quality free Blogger templates.