Have you downloaded and installed the Database Tools?
From the microsoft website:
•Express with Tools (with LocalDB) Includes the database engine and SQL Server Management Studio Express)
•This package contains everything needed to install and configure SQL Server as a database server. Choose either LocalDB or Express depending on your needs above.
•SQL Server Management Studio Express (Tools only)
•This does not contain the database, but only the tools to manage SQL Server instances, including LocalDB, SQL Express, SQL Azure, etc. Use this if you already have the database and only need the management tools. This package includes LocalDB.
As for the MCSA certification: you are free in the sequence of the exams and the time between the exams. Microsoft will keep track of the exams you have passed and reward you the MCSA when you passed all three exams.