I'll start by saying my old man's a drummer, and he's also a damned decent bassist.
Littleoldme, don't you always find they're the last to leave and get to the bar just as it's closing.
Robbo's correct - you don't need to be able to read music. You can learn initially using chord diagrams and something called 'tab' (short for tabulature), which is a bit like written music, but much easier and much more logical. Your having been a drummer will certainly help you in the rhythm department.
If you can hold on 'til September, loads of community colleges will be starting their Autumn evening classes. You can usually find at least one that has a 'guitar for beginners' class. These are brilliant. The teachers are (or should be) geared up to teaching adult beginners and can be great fun, as well as a not-too-heavy way of making a start. Then if you want to take your learning a stage further, your teacher will be able to advise.