We stay motivated by keeping our goals in mind. You got to want the gains pretty bad and be willing put in a lot of work!
Set a goal for yourself and work towards it. For example if you want length , start with 15-20 min basic stretches in first week. Gradually increase workload and methods over time. Start with a too long and intense workout, will increase dropout chances.
You can do it man!!!
Staying motivated should be easy, you now have the formula to make the miracle happen. You now have the knowledge that many will never gain and this is amazing. Use what you have learned and let the motivation be the massive cock you will soon have.