Newbies always ask this, and that’s why this forum has entire collections of tutorials from members answering many time before. It’s going to take you some work reading and trying things, so take your time and read through the Getting started guide then the tutorials, read the newsletters by E.A. and you will have a solid grounding in modern magick, black or otherwise.
The getting started guide with all forum orientation stuff, links to all tutorials and popular megathreads are here: GETTING STARTED GUIDE, Rules, Notables, Tutorials and References.
The first thing to get under your belt are your protections: like spiritual hygiene, then you want to get into developing your astral senses and avoiding impostors and parasites… When you can be sure you’ll not get attacked by parasites, then try Unofficial Tutorials: First Contact from Sigils to Evocation Collection.