Everyone goes at their own speed, so for you if learning one grammar point each day is your “pace” there is nothing wrong with that.
As for learning grammar, there are lots of good free resources online, but if you want something paid there is Genki i + ii.
I think Tae Kim’s guide is pretty popular:
http://www.guidetojapanese.org/learn/grammar
I personally haven’t started on grammar yet, but I have heard “Tae Kim” and Genki I & II come up a lot in conversation, both are highly recommended especially Genki I & II but they can be expensive, so it’s worth using the free resources for now.
If you end up going for Genki, I heard this guy has good videos to go along with it that can help you:
I also think I heard LingoDeer is good for grammar:
Here is a thread discussing LingoDeer if you wanted to do some research before making any decisions, best to be informed!