You probably know that dolphinstreet is a place to get free blues lessons. I also provide lessons in other styles, such as funk, rock, country, etc.
Here are 2 free blues guitar licks in a lesson video. Have a look. You can get the PDF and Guitar Pro files for this lesson if you want - just sign up for my newsletter. You will then get a link to download the PDF and Guitar Pro files, as well as the video in High Definition.
This lesson shows 2 good blues licks, and they are not too hard, I hope. There's a quick move in the first lick where you need to have a bit plectrum technique for playing those five 16th-note triplets smoothly. The 2nd lick is easier - it's almost like a vocal line.