I wish I could play the guitar.
If only I can see you in person, I can tell you more about how to play the guitar.  You play it by strumming or plucking the strings with your fingers while pressing against the frets on your other hand.
It sure sounds like it requires a lot of coordination.
It does take some practice - there are usually six strings that you need to press against the frets to make various chords and when you combine enough of these chords together, you get a song.
Are there many different types of guitars?
Yes - there's a lot of different variations of guitars.  For example, a bass guitar has a similar appearance but only has four to six strings and longer neck.  It sounds totally different as well.
Is one easier to play than the other? Or does the number strings not make that much difference?
The more strings there are, the harder it would be to play as your hand would need to be stretched out more.  With that said, there is also the electric guitar, which is similar to the guitar but uses pickups to convert the sound of the strings into electrical signals.
I bet learning the guitar would open up more new skills, with all the coordination!
Sure thing - you can be a music teacher or a guitar player in a band.  All the famous guitarist you probably know are amazing electrical guitar players.  The cool thing about electric guitars is that you can alter the sound of the signal and change the timbre of the sound.