At your weight, eat eat and eat some more. At 134lbs, gaining some fat should not be a concern at all.
My personal favourite training split when bulking is Push/Legs/Pull.
Focus the workouts around the big compound lifts. So for back, do deads and maybe pull ups. 3-4 sets, 5-10 reps. Workout should be done pretty quickly.
All comes down to diet though. Just keep the protein and cals high, train hard, and you will progress. Biggest mistake everyone makes is over complicating everything. It's pretty simple really. Good luck and keep us posted.