what about
3 sets seated military barbell 8-12 reps
3 sets seated dumbell press 8-12 reps
3 set bent over dumbell fly 8-12 reps
3 set standing dumbel fly 8-12 rep^s
3 set reverse pec dec machine 8-12 reps
3 sets elbow raise machine 8-12 reps
?
The total volume depends on factors like intensity, frequency (times you train a bodypart in a week) and your recovery, so it's hard to say those 18 sets are suitable. I believe it's too much, but again, it all depends...
Regarding your exercises, I believe there's no need to perform more than 3 exercises. 1 exercise for each head (anterior, posterior & lateral) should do the job.
Some suggestions (just pick one per delt part)
Anterior: Front presses (BB, DB or machine), front raises (cable, BB, DB or a plate), etc.
Posteror: rear delt raises (cable, DB or machine), high pulls, etc.
Lateral: side raises (cable, DB or machine), wide grip upright rows, etc
Oh, and keep a log book, in order to monitor your schedule (exercises, sets, reps, weights, recovery)
Hope this helps!
