You could start with buying for eks genki 1 and 2 .

learn how to write and read hiragana and katakana.

after you have learned how to introduce yourself and make easy sentences, hello my name is, nice to meet you, how old are you, whats your hobby etc.

get a teacher on italki and start practicing pronounciation and get used to speaking the language and having a conversation.

get language partners. memorize vocabulary by getting an app or write or from the books.

start learning kanji, (its in the books) write them over and over or get app for that also.

get settings on your computer so you can write in japanese on your keyboard.

Also watch anime and youtube videos get used to listening.

Do you know hiragana and katakana?

more than anything

べんきょうします！

Study!!