Administrative Assistant

My website will be going live in next month. I need someone to send - answer emails, word and excel documents, do some promos, general admin and a few phone calls. There will be other admin tasks in the future, but this will be later on in the year. I used to be a MS Office trainer, so i would require someone proficient to at least my level. I would say that a few hours per day would be required to start with, but i see that increasing over the weeks.