From Weka website, they provide Machine Learning Courses. We suggest you take a look first. If you are especially interested, you could check this course on FutureLearn, Data Mining with Weka from The University of Waikato.
Next, Dr. Khank will introduce machine learning in python, Scikit-learn Project. Scikit-learn provides a range of supervised and unsupervised learning algorithms via a consistent interface in Python. The library is focused on modeling data. You can find install tutorial at here.