So I am preparing on my own( and on budget) for GMAT

Have not booked my test yet, taking my time and want to progress slowly, but successfully.
Looked at this thread:
https://gmatclub.com/forum/don-t-want-t ... 11878.html and this one
https://gmatclub.com/forum/gmat-prep-on ... 82151.htmlFor now, my question is I can get an official guide(OG) from 2016( or maybe 2017, doubtful though?), would that be any different than 2018 or 2016 can be a good start?
I am also looking at GMAT Club Math Book v3 - Jan-2-2013.pdf and GMAT-Club-Grammar-book-2017.pdf.
So question from experts, is that a good start for a beginner or you would suggest something different based on your experience?
P.S: I am also mixing and matching some youtube videos in it too.
Thanks so much for all of your advice and help.