In rock/pop in it's basic form:

Intro
Verse
Chorus
Verse
Chorus
Bridge
Lead
Chorus
Repeat Chorus & End.

A lot of people try to change the basic premise but it usually ends up coming back to that.
If you stick to that sequence, you can always cut and paste it into a different order later with your audio software.
As far as chords go. If it's written on guitar, more than likely it's in A or E cause those are the keys most guys know their scales in. On piano it's usually C.
You'll see an endless repeat of chord structures like: G, Em, Am, D7 or A, G, F, E used in hundreds of songs. In country songs expect to see a lot of C, F, C, G
or G,F,G,C,D
Of course the more you learn about chords and scales and the more styles you can play in, the more you know about different beats, and how certain instruments work together the better off you'll be. Mainly because you'll either come up with something truly original that stretches the boundaries, or do something new with the old tried and true methods above.