Practice, practice, practice - this is a skill, not actually very mysterious at all.
You did good, now do it again until it works.
The getting started guide with all forum orientation stuff, links to tutorials and popular megathreads are here: GETTING STARTED GUIDE, Rules, Notables, Tutorials and References.
The links in that megathread are forum-made tutorials for things like spiritual hygiene, 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.