Ah
Oh, improvising and writing your own music, that's cool. Well as already mentioned there's definitely information on the net, an awful lot, so it's handy to know where to start. If you want to be able to improvise then the easiest way to begin is to learn your pentatonic scales, the pentatonic scale is a 5 note scale (fewer notes than the 'standard' 7 note major and minor scales) this means the shapes are a little easier to learn, it's also
the rock/blues/metal scale as it's been used by guitarists for donkeys. I would look for information relating to these topics: minor and major pentatonics, solo sequences (simple ways to use the scale creatively), popular blues/rock licks (to learn the essential licks any good guitarist will at least be familiar with), melodic soloing (creating short themes/tunes to develop and embelish when appropriate). You need to learn your minor and major pentatonic in at least 1 position each, both scales are the same, there are 5 notes, so there are 5 positions on the neck, look up the CAGED system for more information on this, it's very simple if it's explained properly, again a tutor would be most help here.
You should then investigate the major and minor 7 note scales. if you wish to explore all options available to you for improvisation and also for composition then it would be beneficial to also research chord construction, chord progressions and cadences, (learn as many OPEN chords as you can, and again research the CAGED system) other topics such as key changes, instrumentation (how to write bass and drum parts) will only help to improve your abilities. This knowledge can make things easier when it comes to getting started writing your own music, however it's
completely possible to write fantastic music without knowing a shred of music theory, although it helps.
There's a lot of information here, you could spend a year fully exploring how to solo using pentatonics and still only scratch the surface, self tutoring is rewarding as well as cheap obviously, but it can still be frustrating as there is such a wealth of information available to us now (with the internet, books) that things really aren't much simpler, you need to take your time and learn things slowly rather than try and do everything at once. I should also add that keep learning songs, playing the music you enjoy will keep you inspired, give you entertaining ways to work on your technique as apposed to playing exercises/studying the topics above and as your knowledge of improv/composition grows you'll recognise this theory being put into practise more and more.
EDIT:
Off topic: dude, you have a Suhr? I'm so jealous. Got any pics?
http://img.photobucket.com/albums/v67/Andelusion/Suhr/Suhr7500009.jpg
http://img.photobucket.com/albums/v67/Andelusion/Suhr/7500002.jpg
http://img.photobucket.com/albums/v67/Andelusion/Suhr/Suhr7500016.jpg
My preciouss...