Check this SRS platform built by the WK level 60 user @neicul:
Its way of working is very similar to Wanikani, but more user-friendly than the mainstream options. Since it’s user-base is pretty much Japanese learners, the platform itself is very much focused on Japanese learning, so it will suit well with your needs 
You can search for decks published by the community there on the community centre and see what they have to offer you
Since you’re starting, it might be interesting to start with the Katakana vocab deck (4500 words). They’re loan words, mainly from English. A lot of people avoid learning these words because they’re mostly easy to read/listen, but when it comes to having them in your active vocab and actually being able to recall words, people try to guess a kanji word for so many situations where natives would clearly go for katakana vocab instead. This simply because katakan words are just in their passive vocabulary. Learning them will help you gain some active vocab really quick and it can reinforce your katakana reading which is something a lot of people struggle with
In terms of grammar, I always recommend for starters to start with Japanese Ammo with Misa. Not only does she make things simply enough for those learning, but she is aware of a learner’s struggles and makes sure to cover any question that you might have. Mind you that it’s a beginner’s resource
I recommend you to follow this playlist and casually watch her other videos that catch your interest 