It really depends on what you're trying to do and where you're trying to work. Large datacenters have a variety of jobs including network engineers, L1/L2/L3 support, database administrators, programmers/developers for backend systems, then marketing and sales. One datacenter may have completely different requirements than another. A datacenter could be private or public. Private datacenters are going to be more focused on a certain specialty (hardware/software suite) while public datacenters are going to be more general.
For technical support, L1/L2 probably don't require anything special as long as you know the lingo, can demonstrate the skill set, and show experience. L3 and systems administrators would most likely require certifications or a number of years of experience but not necessarily a college degree. Certifications required would depend on the company, especially dependent on what software they use. Most certifications can be obtained directly from the software company (Microsoft, Redhat, Oracle, SAP, etc) or from a school. Many community colleges will have options for obtaining certifications.
I think your best bet is to reach out to a few datacenters near you, or where you could see yourself, to see what type of certifications or experience they recommend. A community college may be a good place to look too, usually very affordable and they may have work (or internship) programs with a company that can give you experience.