You can delete all the columns except the Keyword, Competition and Global Monthly Searches Column.
Delete the data in the Competition Column
Add 1 more column, headed Ratio.
Format the Competition and Global Monthly Search Volume columns as numeric with no decimal spaces.
Format the ratio Column as numerical with 2 decimal spaces.
Once this is done, you need to research the competition. You need to know how many pages compete for your keywords, so you can work out which are the best keywords to use.
Remember, to start with you are looking for high search volume and low competition and you will use a simple Google Search to get the numbers.
Simply go through you keywords list and search for each keyphrase, but enclose the key phrase in " ". For example when searching for medge kindle covers, I entered "medge kindle covers" in the Google Search box.
Once you have researched all your keywords, sort the data in the Ratio Column in ascending order.