Paterson tanks are pretty foolproof. They've made a few versions over the years so I wouldn't worry if yours isn't identical to one in a video.
Agitation is a whole topic of discussion (hot debate?). Everybody finds a method that works for them and yours might evolve over time. For now, just try to make sure you do it as consistently as possible. Accurate timing and the same, identical motion every time. As long as you're moving the chemistry around in the tank in a fairly random pattern and not shaking it up like a martini you should be fine.
Continuing from this, the following is what I recommend to people. When you read through this, it helps to realize that it is far harder to describe than to actually do (or demonstrate!)
Pick up the tank and hold it between your hands, with the tank tipped over so its side is essentially parallel with the ground/sink/counter top.
Hold the top in the palm/fingers of one hand and the bottom in the palm/fingers of the other hand.
Now move your forearms and hands so that the top rotates to point up to the ceiling and the bottom rotates to point to the floor - take about one second to make that motion.
Now reverse that motion - move your forearms and hands so that the top ends up rotating to point down to the floor and the bottom ends up rotating to point to the ceiling - take about one and one-half seconds to make that motion.
It is almost like turning a steering wheel.
Now reverse that last motion once again, until the tank ends up upright again.
All in all, you will have just spent about 5 seconds agitating the tank and the solutions inside it.
For me, that is one sequence of agitation, because I use the Kodak (5 seconds each 30 seconds) scheme of agitation. If you prefer to use the Ilford scheme (10 seconds every minute) that works well as well - just repeat the sequence I described once again. Either scheme is fine, as long as you choose one, develop a comfortable speed and rhythm and do it repeatably.
Note how that series of movements naturally result in the tank (and your wrists) both inverting and rotating on the tank on its own axis. Together, that inversion and twisting gives you nice, random agitation at a comfortable level and velocity.
If you have put the right amount of solution in the tank, you will hear (and maybe feel) the solution tumbling through the reels and film. That is exactly what you want.
The role of agitation is to move partially spent chemicals off the surface of the film and replace them with fresher chemicals. Random movement is important - that is why using twist agitation alone is a source of potential problems.