Hello Mariusz,
First off, are you dedicated yet? If not then this path may be destructive to you as you will not have protection.
Secondly, read over the techniques on the website as many of us use those to a "T".
For scrying; You can use any dark surface, such as a bowl of dark water, a black mirror or even your phone screen if all else is un available. You will eventually see a smoky haze in the mirror and you should work to condense it until the ectoplasm fills the reflection with cloud of smoke looking fog.
For astral projection; You must be in such a trance that you truly no long are aware of the physical body. Once it is no longer felt and you are laying on your back, spin the chakras clock-wise (reverse of their initial spinning path) to stop them. This is like turning a knob. Next, try to elevate yourself out of the body. Visualization to the location you wish to appear is key. But you should understand the difference between astral projection and astral viewing.
Projection is the astral body being able to interact with the environment and walk around. Viewing is simply just seeing over where you are trying to go or who you wish to watch over.
These are just some of my tips. Read and study more.
Hail Odin, All-Father! Hail Lady Agares! Hail to our Legions!