Which track should I take to ready myself for Database Design and Development class?

I would recommend taking the SQL basics track. I personally haven't taken it, but it looks like they go over SQL syntax (which in my opinion is not to difficult to learn).

If you are taking a SQL class you will most likely be using MAMP, Sequel Pro, or MySQLWorkbench.

Most developers only learn the basic CRUD operations, but you can also do more complex things like functions and procedures, conditionals etc.

I would definitely do the two that Ryan has linked to. The SQL basics course is simple and gives you the basics. It's a bit fast paced, only because it is a basics class and is just showing you the starting foundations for SQL. From there you can move to the very in-depth Database Foundations. This is much more detailed and will probably take 6+ hours to complete, but you will have a strong understanding of the Database structure (by no means an expert yet, but enough that you can move forward from there).

Once those are done, you'll have to decide if you are only going to work with the Database, or with a language that interacts with it. Treehouse also has courses on PHP and Databases ... Python and Databases ... ect.

Keep coding! And good luck with your path. :)

Thanks