Awesome. Right now I am trying to learn a bit of Japanese because of future endeavors (I've talked about this in another thread.) I've been looking at Kanji (and words), sentence structures, and such. So far it is still at an elementary level. I enjoy it because I am watching online videos in Japanese... and I got to learn quite a bit of Japanese online culture (many of them very funny.)
Some tools that I have used (I might look for something similar in a few years to learn another language.)
Anki - It's like a flashcard for smartphones (but also available for computers.) Basically, you input as many words and phrases as you want. Depending on how many words or phrases you want to learn per day, it'll remind you to learn between 10-30 words. And, depending on how familiar you are with the word, you can say that it is easy, good, hard and it'll bring that card back to the deck later in the week. Some languages already have a whole list of words and phrases already created by others. I'd assume French, Spanish, and Japanese have a lot of Anki decks. So, if one of your first French words was "Bonjour" you'll continue seeing that word until you remember that it means "Hello" in French. then after, say 1-15 days, you'll see it reappear so that you don't forget what it means.
Media - because Japan has a big media presence, at least online, I look through nicococo, anime, video games, and documentaries in Japanese. So far, this is mostly for getting accustomed to hearing words and phrases besides just looking at them. Even though I am already accustomed to hearing the language, I am not accustomed to hearing the language for words. But when I do, I can sort of guess what one means. This is actually a great way to listen to French and Spanish.
Windows Japanese IME - great tool for typing in japanese. It makes it so that you'll start remembering the Katakana and Hiragana you type, but it also allows you to change hiragana to Kanji. head to a place that you can type rudimentary Japanese, and you'll learn a lot.
JED - it's a Japanese - English translator (and vice versa) I use it to search for Kanji through radicals to find words. When looking through material I can copy and paste, this is my go to. I can search for most kanji this way.