I would do study, because you shouldn't jump into things you don't know about. Especially with spirits, because they're human beings and they have their own wills and will do what they want. First off, I would do more than a protection spell. Sometimes spirits don't want to be summoned, and then you bring them and they're really grumpy or you could even bring something negative unintentionally. You could use sea salt, cast a circle, and have smudge sticks just in case.
About spirits though, the best thing to do is have respect for everything you encounter. Even if you're scared, don't be rude in any way or you're asking for trouble. If something comes and you don't want it there, kindly tell it to leave. If they're stubborn, then make them go. You don't have to be in a bad situation if you don't want to be.
Besides that though, a lot of spirits are really nice and can help a lot with magick and can provide a lot of knowledge. I know people who have been friends with certain spirits for years.
I hope this gives at least the basics of what you need to know, but make sure to do some research! I hope things go well for you (:
Love, light, and blessings! )O(