Welcome, Kate. I'm a newbie too and find it overwhelming. I've had good luck with intuitive (psychic) healers, shamans, and by using forums like this one. I'm starting to realize that I'm not "that negative person" but just taking on everybody else's bad energy. I find it hard to pick up good energy, though! I have very little money but it's well worth it to spend it on a session with a healer. I'd rather feel good than have a new pair of shoes, anyway.
I would recommend the book "Self-Care for the Self-Aware" by Dave Markowitz. It has some great exercises for empaths. You can find it in pdf form online if you google it, but it's also not very expensive - just a tiny little paperback book.