Are there any resources to find modern (or effective) assignment types, knowledge control techniques?
The number of students in each blended course is definitely a consideration when creating effective assignments and assessments of student learning, however, the most important consideration is the student learning outcomes (SLOs) - what are students expected to do, think, or know by the end of your course?  The SLOs will direct the design of the assignments, as well as the assessments of student learning, for your course. Here is a very short training to help you learn to create assignments and assessments from student learning outcomes: http://jeandowns.weebly.com/  There are additional resources and references at the end of the training.