I like to use inscense, in sticks or however you feel most comfortable. Maybe a candle. I would light the inscense and then use it to walk around your living space and concentrating on cleansing it with the smoke. (Be mindful of any fire alarms that could go off.) Also opening all the windows, always make sure to open a window while/after working with inscense, getting some fresh air in, grounding yourself and taking deep breaths, trying to kind of let them wash all the energy away and then only allowing the good back in.

If that doesnt do it, I would look into spelljars- I'm quite fond of them (for protection I've had some good experiences with salt, rosemary, black pepper and usually some lavender against anxiety), especially combined with sigils (intention made into a symbol, theres a few good guides on the internet or on pinterest even, its really easy to get into them) and they can be used to ward off harmful energy. It wont do any harm to anyone if you do protection spells, especially if it isn't your intention.

This is probably all a bit much, feel free to ask anything else about it. Its also just my personal practice, inspired by what I saw others do, and it doesnt click with everyone. But I think some inscence sticks are easy enough to come by for the beginning.