1. Start with the fast.ai courses. It's an applied deep learning course using state of the art techniques. 2. For classical machine learning (regression, etc...), Andrew Ng's course on Coursera is widely considered "the basics" 3. As you progress, check out CS231 and CS224 from Stanford for state of the art image processing and natural language processing techniques. The lecture videos are on YouTube and the course assignments are available online. The third course I recommend is Geoffrey Hinton's neural networks course on Coursera (he is one of the most important researchers in the field). 4. If you're an application engineer, focus on using existing tooling to build cool projects. Keras and scikit-learn are great out of the box tools. 5. If you are more research oriented, you can start reading papers. In Silicon Valley, there's a meet up group that reads papers every Monday and tries to implement the algorithms in the paper. It takes a while to get to this level, but try not to get overwhelmed. Experts spend 7 years studying this stuff full time to get a PhD. 6. You really don't need much math to get started with ML. A high school understanding of calculus and some basic understanding of numerical optimization are the two main concepts you need to know. If you want to get into the research, there'll come a time when you will need more advanced math, but in my experience you can pick that up as you go along if you are curious.

Maybe you could start an AI study group online? The Silicon Valley study group was great, but I was just visiting.