The good news about guitars is that you don’t have to know how to read sheet music - the internet is full of guitar chords and tabs. Chords is something you should learn by heart and tabs… you just have to be able to press the strings, no theoretical background is required whatsoever.

Guitars are very internet friendly - you can find everything you need to know about it online, including tuners. There are lots of cool things you can do while learning to play. You can open MIDI files and look at the music code. I used AnvilStudio on Windows and Rosegarden on Linux:
Anvil Studio | Free music composition, notation & MIDI-creation software
Rosegarden: music software for Linux

I think one of them can even convert sheet music to a guitar tab. If you’re interested, you can open a MIDI file with one of those programs to see how it works. You can look for midi’s using a search engine like MIDIsite - MIDI Search Engine