Andrew Wasson. Graduated from Hollywood California's Guitar Institute of Technology. Operates Music School and CreativeGuitarStudio.com
While many of these ideas can slowly develop (just by ear) over many years of jamming, study and through learning the guitar solos of your favorite guitar players, there are a few other concepts which can help speed up the process.
Guitar players need to have a good enough ear for hearing the notes that we want when we're creating different types of melodic resolutions into specific scale tones. These "choice tones" will work to uniquely affect the backing chord of the moment. Well placed use of chord tones, suspensions and scale extensions will all come together to make a big difference in how your guitar solos sound.
Of course, this is obviously a lot of stuff to develop, (and it will take time), but I'm going to break it all down into a system for you that you can start working on right away to help you learn the basics of "Lead Guitar Soloing."
About the Author:
Andrew Wasson is a 1992 Graduate of Hollywood California's Guitar Institute of Technology (G.I.T.). He has operated his Canadian Music School, Creative Guitar Studio, for the last 20+ years teaching thousands of guitarists both in studio sessions. You can learn more at his official website.