Learn as much as possible...about everything. Even if it is outside your job description.
Network. Meet people. Make small talk.
Have fun. Always give your best.
Melissa recommends the following next steps:
I always say, I wish everyone took the office admin course, because a lot of the things you learn in the course such as document formatting, customer service, and organization are skills some people are never trained to do! Don't undervalue the skills you learnt. Understand that from your certificate program you have learned key skills that others need. Identify what you are best at and showcase them for your workplace and become the go-to person for all those admin skills.
Hope this helps :)