Social Media Posts and Videos

We need someone to design and post social media posts mainly on Instagram and Facebook. Frequency of the posts should be 3 posts a week on each handle, it could be the same material with just different screen dimensions. The length will be 4 weeks and after the end of 4 weeks if the work is up to the mark then we can discuss long term collaboration and sign up for 6 months to one year. The posts have to be a mix of pictures and videos.