Welcome!
Start with Bunpro + DOJG + Japanese Ammo with Misa (Youtube).
For drilling conjugation (which you will need to do soon), use the Japanese Conjugation City app (mobile) or Don’s Conjugation Drill.
For generial practice, use Lingodeer in your spare time.
These will keep you plenty busy.
Alternatively, you could do it the Refold way and barely learn any grammar before you jump into immersion. This is likely to be more fun.
Alternatively 2, there is a JALUP purchase group for those of us looking to acquire JALUP (specifically for grammar in the beginner deck) at a discount. You’re welcome to join.
Some will suggest using a textbook. I detest most textbooks for Japanese self-learning, so I cannot provide objective advice.
PS. It is generally not a bad idea to lend some credence to my opinions on resources as I tend to try virtually all of them.