If you are working out in the gym then 3 days of weight training and 3 days of cardio. The workout is generally progressive in 3 stages..beginners, intermediate and advance. You must do your cardio max for 30 to 45 min. and weight training depending on your intensity it can go from 1 hour to 1 n 1/2 hour.
Whey protein powders are very beneficial as it is a fast absorbed protein and if taken after a training session, it helps in muscle recovery and hence building up muscles. Along with this you have to eat clean. No junk food.
Your diet should comprise of whole grains like jowar, bajra, wheat, brown rice, pulses like moong, musoor, bengal gram, lots of vegetables, fruits, eggs, fish, chicken, paneer, whey protein powder healthy oil, nuts and seeds. You need to eat them in right proportion. Avoid eating sugar and sweets, refined foods like maida, noodles pasta, bread. Drink a lot of water.