Hello Temiloluwa,
I thin you can start with your personal brand - start to build your own brand, do some research and reading, and gain an understanding of social media on your own. I think you should also aim to work at an agency, just to gain as much experience as possible from as many experts and creatives as possible. I always mention Wild Fusions and Anakle - they are two places to gain knowledge from a digital marketing standpoint. I am sure there are a whole lot of other digital agencies that you can get great experience from, but definitely try to start off in an agency.