Meditation.
You have to meditate and advance spiritually in order to meet and communicate with the Gods.
There are also some Divination Tools you can use.
You can use the Ouija Board to communicate with the spirits or the Demons:
https://www.joyofsatan.org/www.angelfire.com/empire/serpentis666/Ouija.html
If you need easy questions you can also use a Pendulum. But remember, if you feel very strongly, you may influence the divination tool you are working with and it may produce incorrect answers. It takes time.
https://www.joyofsatan.org/www.angelfire.com/empire/serpentis666/Pendulum.html
In both cases, you have to be advanced. If you are not, hostile foreign entity can interfere with your attempt of communication, leading to incorrect answers and or negative energy, taking you nowhere or worse.