Yeah! that’s the one . And yeah it’s not complicated but totally drives that song. ive seen people debate if paul played it or not.
The first thing to do is look for a copy of The Beatles: Complete Scores. Here's the Amazon link. That will help a lot with the other tips that have been given.
Like others have said, you don't have to do anything, but if you pick up the Beatles Complete Scores and take a look at how often they change keys and how it's notated, it's pretty rare.
As always it starts with playing something very simple and singing over that... playing quarter note chords on the piano with a few chords and figuring out a melody with your voice is a great way to start... watch some videos of people playing and singing at the same time, you'll notice that the parts they play will sometimes get simplified when they are singing, and then become more intricate when they can focus on just the parts.
I would like to point out that many piano books aren't actually the exact way the artist plays the song, in fact most of the songbooks include the melody line in the right hand that should be sung, and not played...
If you were to get the Beatles Score Book, you'll quickly realize that a lot of the melody lines are sung over a chord progression that is much easier than playing the chord progression and the melody line while singing the melody line as well...
Awesome, I want this one.
www.justinguitar.com, mah man.
Easy peasy. When you're done with that, head over to /r/Guitar and ask around.
Face to face is useful for learning proper position/pick/strumming technique, but mostly you should be listening and learning by ear.
So I'll walk you through the basics in no particular order once you've gotten over the fingertip pain and can switch chords pretty quickly.
Memorize the notes on the fretboard. Every string. Every fret.
Find trusted tabs for songs you like. Try to play along while listening to the song. Apps like Reaper have "slow down" functions that maintain pitch.
If you are a Beatles fan, The Beatles Complete Scores is invaluable. Even if you aren't a fan, it's a great resource. I'm not a fan of the "professional" tab sites, so do your research if you think you want to subscribe to one of them.
Learn your chords.
Learn your scales.
You don't HAVE to learn music theory, but it helps. Especially if you're playing with other people. So, circle of 5ths and all that.
DM me if you have questions or I'm in Culver City if you want to meet up.
Caveat, I'm not a pro. I don't teach for a living, but I've been playing for far too long and know just enough to get people started. :)
I don't know about websites but here are two books for The Beatles and Queen that may be good for your purposes.
Beatles: https://www.amazon.com/Beatles-Complete-Scores-Transcribed-Score/dp/0793518326
Queen: http://www.sheetmusicplus.com/title/best-of-queen-transcribed-score-sheet-music/5679977
See this thread for why sheet music rarely matches what was originally played. However, some publishers are starting to publish accurate transcriptions of the originals for those people who want them. For the Beatles, someone in that same thread posted a link to The Beatles: Complete Scores which is supposedly quite accurate.
If you are a musician, pick up a copy of the Complete Scores. It's about 80 bucks (53 on amazon!), and contains the sheet music for every instrument for every song they ever recorded.