eat your bodyweight x20 to start with on diet. make a percentage ratio split of 40protein/40carbs(complex and simple)/20fats. Space the meals out every 2.5 hours in your day.
As for the workout, it is best to build strength/mass together, i think. So you can either have a hypertrophic week and strength week alternating, or you can concentrate more on hypertrophy and have a strength day within that week.
example:
week 1 hypertrophy (10-12 reps on all exercises; use common sense in your set scheme. also, going to failure is not necessary)
week 2 strength (the classic 5x5 routine for all compound moves with something like 4x6 for all others)
continue
OR
each week do on Tue/Wed/Thu do hypertrophic, working Chest/bis, Back/tris, Shoulders/legs and then on Sat do a full-body strength routine, something of 3x5 for all compounds and 3x6 for all others.
These are TENTATIVE examples just to show you SWITCH-UPS are ok.
P.S.- if you are like a lot of people, then you probably have not enough workout variety. be inventive with sets/reps/exercises at all times.