The critical thinking process starts out with knowledge. All thinking starts with knowledge, whether a little bit or a good understanding of your thinking topic. For example, if you were thinking about how to fix a machine, you would want a good understanding of how it works and what the problem is.
The next step in the process is comprehension. It is the understanding of what you think about. If you can't comprehend what you're thinking about, you can't think about it effectively.
Another important step is application. If you can't apply your thoughts and knowledge to anything, what good is thinking about it? Find something useful to think about.
The next step that you need to do is analyze what you're thinking about. Divide information up into categories and subcategories. Select things that are the more important aspects, and solve them first.
The second to last step of the critical thinking process is synthesis. Syntheses is organizing, constructing, composing, and creating your finished result.
The last step is evaluation. See if you like your finished product. If not, go back through the process with different objectives and goals, keeping in mind what you didn't like. If it comes out to your liking, use it!