My most dear, most kind, most precious wish-fulfilling one,
Thank you for your email. Liberation in the Palm of Your Hand is the main lam-rim text you should study. Also try to read Lama Tsongkhapa’s Middle Lamrim, but the main text is Liberation in the Palm of Your Hand. 

Please read and study it from beginning to end. Write down any questions you have and check with a geshe or teacher who has studied the lam-rim well. Read it twice from beginning to end. You can read any other lam-rim text, but Lama Tsongkhapa’s Middle Lamrim is one main one.

Anything you don’t understand, discuss with students who have studied well, who know it well. There are Sangha there, so it is easy to get questions answered and easy to study. If you know someone else or other Tibetans, then you can do that with them.

Use as a daily book The Essential Nectar or the outline of Liberation in the Palm of your Hand. After that, you can do effortless meditation.

This is the most important thing in the life, how to develop your mind in the path to enlightenment. Even if your life becomes busy, daily meditation on the lam-rim is so important. Do this in the morning and in the evening, or just in the morning two times, or at least once a day with the preliminary practices.

With much love and prayers...