If we all knew how to weight train correctly then we would all be ripped and buff, but because many misunderstand weight training techniques many fail and never reach their muscle building goal.
It is important you set a realistic goal for yourself and commit to your daily weight training workouts and nutrition.
Motivation
A motivation is essential, make sure you keep your eye on the goal and keep yourself motivated with whatever reminds of why you want to gain muscle.
Invest on a Muscle Building Guide
Get advice and guides. If you knew nothing about computer repair, you wouldn't risk repairing your computer on your own right? Same goes with muscle building. If you know nothing about muscle building and muscle building exercises then the best thing you can do is invest in a muscle building guide that gives you all the guidelines you need for the best muscle building techniques.
Keep up with your progress
Keep record of your progress, this is a great motivation as well. Keep track of how much muscle you are building and how much fat your are burning, if you are doing everything right you will start to see the change and be motivated to keep on going.