I recommend spending less time focusing on single words that and more on learning a bunch of super useful short sentences. Many very important sentences in Thai are just 2 or 3 words so as soon as you can start fumbling your way through easy words, I’d get started on these high frequency Thai phrases.
How do you learn these Thai sentences? First, you need to learn how to read the Thai script. Then choose a few of the sentences below and spend a bit of time practicing saying them aloud every day. If you are in Thailand, start with sentences you can find an excuse to use in real life that tends to have the highest chance of sticking. The order is arbitrary, but some of them will be more useful than others depending on your situation.