Marketing Assistant Needed

I run a small marketing agency and i’m in need of a Marketing Assistant. Someone who is familiar with the following areas:
- Commercial Production (TV,Radio and Newspaper)
- Digital/Social Media Marketing
- Media buying (Booking ad space for commercials)
- Copy Writing

I need someone who
1. Is great at Following up
2. Pays attention to detail
3. Has a great command of the English language
4. Is trustworthy
5. Works fast and able to work with short deadlines