Next Step: Training for a 10K

I've been running a little over three miles four times a week. On Saturdays, I try to double that. This Saturday I ran seven miles. This is the farthest I have ever gone! A 10 K is 6.4 miles, so I want to do that for my next race. 

http://www.fitbie.com/get-fit/beginners-guide-running-10k-checklist?ocid=NL_FBGF_1821830_08282014_Beginners_Guide_Running_10K_Checklist