Step 1: how Thai script works
What you will be able to do
Understand what you are looking at when you see a line of Thai, and why it is more learnable than it appears.
Thai is an alphabet, not a set of characters to memorise as pictures. There are 44 consonants and about 32 vowel forms, and once you know them you can sound out any word, including ones you have never seen. Four things make it look harder than it is. There are no spaces between words. A Thai sentence is a continuous run of letters, and spaces are used roughly where a European language uses a comma or a full stop. Vowels are written around the consonant, not after it. A vowel can sit before, after, above or below the consonant it is pronounced after, and sometimes wraps around both sides. Tone marks stack on top. They sit above the consonant, and above any vowel that is already up there. Every consonant carries a class, which decides the tone. That is the real work, and it is why this track teaches the classes early rather than as an afterthought.
Common mistake
Do not learn the letters in dictionary order. Learn the common ones first and start reading real words within a week, or the whole thing stays abstract.