Hi Gomomon and welcome to the forum. I am excited to hear that you want to learn Japanese. Let me give you some advice.
I know you want to learn vocabulary. I know you want to learn grammar. I know you want to learn greetings. But I am going to ask you to hold off learning these things for right now. There is something you must do before you start learning these things.
The Japanese writing system is very difficult. Because of this, in the beginning you need to devote a lot of your energy to learning a Japanese writing system called hiragana. (I see you have included some hiragana characters in your post. Have you already learned hiragana?)
Hiragana consists of 71 characters. I have included a chart at the bottom of this post.
Actually, there are only 45 basic hiragana characters. Look at the left side of the chart and you will see that a number of hiragana characters on the left side are merely repeats of hiragana characters on the right side but they also have a " symbol or a small circle in the upper right-hand corner of the hiragana character. (So there are actually only 45 basic hiragana characters.)
Watch this video. Copy along and write out the hiragana characters as you see them being written on the screen. Stop the video between each hiragana character and take your time to write them out.
Writing Hiragana - Stroke Order
Many beginning students of Japanese become discouraged because they find it very difficult to learn hiragana characters. Don't get discouraged, hang in there, and take the time to master reading and writing hiragana characters.
Here are the first five hiragana characters.
あ pronounced "a" as in the name Kawasaki
い pronounced "i" as in the name Kawasaki
う pronounced "u" as in the name Suzuki
え pronounced "e" as in the word Zen (Buddhism)
お pronounced "o" as in the name Tokyo.
By the way, Japanese can be written from top to bottom (and then from right to left). If you look at my chart, you will see that I have placed あ, い, う, え, and お in the far-right column, from top to bottom. (Don't worry, you can also write Japanese from left to right.)
Let us know when you have learned how to write the first five hiragana characters.