Before you try to contact spirits, it would be wise to spend some time developing your astral senses first. These are dormant senses that allow you to see, hear, and feel spirits. I recommend training them first, as they pretty much form the foundation for spirit contact. Here is a link to a guide on training them:
As for the summoning of spirits, there are many guides on this forum that would help you out as well. Heres a link to a very basic evocation procedure:
The book ‘Summoning Spirits’ by Konstantinos is also a good read for beginners, and even has exercises to train your astral senses. Some Great entities for beginners would be Lucifer, King Paimon, Azazel, and many others. They’re very patient with beginners and will guide you further on this journey. Hope that helps. Cheers!