Search which course you want to do.
Finding the course that meets your requirement and matches your learning path isn't that easy. Read the decription of each of them and decide.
Read the Syllabus and pre-requisites of the course.
Get an overview of the topics the trainer would be covering and make sure you meet the pre-requisites, so that you don't feel stuck in the mid.
Check the venue and schedule of the course
Starting anything with a little motivation is easy but also make sure you attend all the classes and have time to complete all assignments.