If my key is D major - the chords are D, Em, F#m, G, A, Bm. - notice I have them written in the music alphabet order (go back to A after G) - I start on the letter of the key.
Start with chord 1, and then go where ever you want. The third chord needs to follow the rule.
Here is a chord progression that I made up using the key of D major:
D (1) - I want to go to chord 3 next
F#m (3) - now I have to go to chord 6
Bm (6) - now I have to go to chord 2
Em (2) - nor I have to go to chord 5
A7 (5) - I added the 7. Now I go to chord 1
D (1)
This would make a good verse chord sequence
For my chorus I could do this:
D (1) - next I'll go to 4
G (4) - next I'll go to 5
A (5) - then I go to 1
D (1)
Some other common chords progressions you could try are:
D (1) Bm(6) A(5) G(4) or D(1) Bm(6) G(4), A(5) or D (1) Bm(6) Em(2) A(5) or D(1) A(5) Bm(6) F#m(3) or D(1) A(5) Bm(6) G(4)
Different styles have different playing techniques - eg reggae - play the chords on the off beat. Rock - on the beat, and add distortion to the guitar. Pop - clean sound on the guitar, find an easy strum pattern.
The drums have a big effect on the style - so think about adding a drum beat to your progression.
Playing chords on the piano and holding them as long notes gives a nice background harmony.
Happy - Sad - Angry - Fun - Upbeat - Relaxed - Fast - Slow - Serious Set the mood with the way you play and the chords you choose!