Oh that's good.
I'm not sure how much Japanese grammar you know, but if you have already finished the study of hiragana / katakana, next stage would be Kanji.
We learn the easiest one at first, for example, one in Kanji is 一, it should be the easiest Kanji.
And for me.
I know almost nothing about your language.
Firstly, I'd like to come to be able to read Thai character, like "สวัสดี".
Thai character is quite confusing for me, and I don't know how can I remember them.