I'm trouble singing and keeping a strum pattern at the same time, what's a good song to start with?
Anything. Take something simple, simplify it if you have to, and just practice. Gradually build up to more complex rhythms and singing.
Start with a song you know very well. I started with Needle and the Damage done by Neil Young. The lyrics follow the chord progression, and you can simplify the guitar playing too.
Start with a song where the strumming and singing pattern is similar.
wish you were here is ez one.. C D Am G repeat ..is the chorus slower paced too.