Spreadsheets can take you only so far. Learn the basics of sustaining business data, ERPs and their uses, and how to evaluate ERPs before choosing one for your business.
After choosing an ERP you want to go with, implementation comes into the picture. It's often a huge time investment but by choosing certain methods and practices, implementation and go live can be achieved a little faster.
Know the different modules that are available in an ERP system and what are the basic features you can expect in an ERP