Those are rather common words so depending on your learning source you should be able to read most of it (enough to understand meaning) in a month or two.
From this picture definitely worth learning first are those words imo:
行く - to go
先 - ahead, first
前 - before, in front (of)
ない - not
この、これ - this (I recommend to look it up because it's little more complicated than 'this')
Remember to be consistent in your studies, it's better to learn for 10 minutes every day than an hour every week.