Welcome!
Read the guide on the website, and start with the complete beginner videos. Repeat videos if you have troubles to understand them and you still stay engaged.
Start with a few minutes a day, build a habit, then increase your immersion volume.
You can take it really far just with those steps. There is also other strategies how to attack vocabulary and grammar, but other people use more those techniques.
There is always some people on the CIJ discord server which you can ask.