As for tabs on arpeggios, it's like cytania wrote:
Play the root of the chord with your thumb ( for Em that's the open Low E String, For Am it's the open A String), then do a pattern with your first second and third finger on the G, B, High E String.
Em Am
E---------------0------------------------------------0-----------
B-----------0--------0-------------------------1--------1--------
G--------0----------------0--------------2-----------------2-----
D----------------------------------------------------------------
A---------------------------------0------------------------------
E-----0----------------------------------------------------------
like a river flows
See the pattern? It's always root note G B E B G. The root note is usually on the lowest (in terms of pitch) String that is involved in Chord.
So for your Elvis song, you need the chords Em, Am, A7, Dm7, G7, you can look those up in the resource section here at chordie.com
Remember that the thumb plays the three low pitched strings, and your first, second and third finger stay on G B and E String respectively.
Practice on one chord until you can play the pattern at tempo, use a metronome if you have one. By that time, the muscles in your hands will have gotten accustomed to the pattern so that you can stop focusing on your picking hand and focus on the chord changes and the singing.
Cheers,
nc