Since you’ve already stumbled upon the forums, I recommend reading around and getting some better understanding of how the Wanikani SRS system works so you don’t end up burning yourself out like lots of people do. (Plus you have loads of time in the first few levels with such few items in your SRS queue)
The gist is that you can manage your own workload which you can dictate by how many lessons you do per day (and keeping apprentice and guru level items at a certain level).
You definitely want to be looking at studying grammar alongside the kanji (there is no need to wait!) too