Welcome to the club!
You found the community pages which is a great step towards becoming comfortable with WaniKani. The community will be able to help you with heaps of questions regarding sentences, grammar, culture and just general off-topic chewing the fat if you need to destress. It’s a fantastic resource whether you continue or not so please come hang out with us.
The first three levels will feel slow but keep an open mind and set up 2 times per day where you will do your reviews. There’s all kinds of guides and insights form our predecessors who have finished the whole course and developed strategies to get through it.
Daisuke Jigen linked you the User Guide
The unofficial guide may help you too. Unofficial FAQ