Especially since you’re just starting, the most important thing is to make Japanese into a daily habit. Show up for reviews every single day, at multiple times per day if you can manage to, because the smaller you keep your review batches, the more manageable everything becomes. If you keep it up for 2-3 weeks straight, you’re likely to settle into a routine.
If you haven’t already, make sure you download this: [Userscript]: WaniKani Ultimate Timeline
The preview image makes it look complicated, but all you have to do is install it to know when your reviews are coming up. The first few levels feel notoriously slow, but they’re also free 
If you’ve got an iPhone, you can do reviews with an app called Tsurukame. Using a keyboard on a computer is still much faster, but it’s nice to be able to do reviews anywhere you go 