Lessons
I have been teaching harp for 26 years and focus on a non-classical technique more suited to the unique qualities of lever (Celtic) and early harps.
I teach online, and lessons are $50 for a one hour session. I prefer weekly lessons to allow the reinforcement of good techniques (and nipping any bad habits in the bud) but this can be tailored to suit your circumstances.
While the ability to read music is helpful, it is not a requirement before beginning lessons, you can learn as you go.
The only real necessity is your own harp!
I can help you find an instrument from a number of sources including local luthiers and stores that sell many different models from a number of very reputable makers. The most important thing is finding the instrument that best suits your hopes and goals.