Without knowing you personally hard to suggest:

Generally: Tanya, Derech Mitzvosecha

First review quickly to get a general idea of the material and only later get into the details.

Sefer Sha'ar hayichud from the Mittler Rebbe has the order of hishtaleshelus and meditations.

In year’s bygone people just studied Torah without methodically etc. and there were great Talmidei Chachomim. Today with all advances there is just the opposite that we would have hoped.

Study Chasidus without looking at the clock

Immerse yourself in the study as in a Mikvah