You can't really learn it from PDF. Go on youtube, type in "Lee Holden Qigong" and you'll find lots of videos. His 20 minute morning and 20 minute evening routines are what I started with.
It is very okay. I have done it myself for quite a while and the results were tremendous.
Falun Dafa is good as well, here's the link ; https://en.falundafa.org/