Im looking to do some projects with permanent magnets. I dont have access to a gaussmeter and i'm wondering if there are any sites that have representations, descriptions or formulas for the field strengths of ferrite or neodymium magnets. Also i need to learn about how magnetic fields from permanent magnets interact with each other in attractive and repulsive situations containing mulitple magnets. Im guessing im going to have a lot to learn as I have no formal physics education. Any help enabeling me to understand this concept would be appreciated.