I downloaded the app called “Mass Readings” for Android and looked at the LotH part. If we are talking about the same app, then you don’t need to know anything. It puts exactly what you need to say on any given day, all in the right order. Just choose the part of the day you want to pray under its menu, and then say what it tells you to. The only things not to say are the headings, which are in bold.
If you want to know the proper postures for the different sections, then here:
Introduction: Stand
Hymn: Stand
Psalms: Sit
Canticle: Sit
Reading: Sit
Responsory: Sit
Canticle Benedictus (Morning), Canticle Magnificat (Evening), Canticle Nunc Dimittis (Night): Stand
Prayers and Intercessions: Stand
Everything else until the end: Stand
The only other thing to remember is that you make the sign of the cross as you begin the introduction, as you say the very last line, and as you say the first line of the Canticle Benedictus, Canticle Magnificat, or Canticle Nunc Dimittis.