Welcome to the forum, Caleb. I've tried playing a bit like Johnny myself, but not a whole lot. I'd normally warm up with the first Ramones album, but it wasn't made much easier for me when I was trying to play my 66 with a set of .13s on it.
Have you seen any of Hardly Ramone's videos? He's the best I've seen on Youtube for Ramones covers. He didn't start out with the Hallmark Johnny Ramone Signature, it's a more recent acquisition. He works as a cinematographer, which explains the quality of his videos. This seems to be more of a hobby for him, though.
One of Hardly's "Rockaway Beach" Guitar Covers:
https://www.youtube.com/watch?v=jLxaJDCtRuMHardly's "Oh Oh I Love Her So" Guitar Cover:
https://youtu.be/fx-evq5I8qgAlso, one of the other things I've learned of Johnny's techniques (you didn't mention it, so I'm not sure if you know) is, he'd often switch between playing all 6 strings, and just the bottom 4. So instead of the whole down up down strumming, you get more of a "FULL-part-FULL-part" sound, one that pulsates. This is a bit more obvious in "Oh Oh I Love Her So" than in "Rockaway Beach."
(Also, there's supposed to be a "Youtube" embed video feature on the forum, which explains the button above the create message box, but the feature doesn't seem to be working now.)
- Austin