Hi Erin,
I would create a welcome packet. There is a great thread
here on VAF as to what that wold include. Make it look great.
Create a professional email introducing yourself and the go right into how you can provide a solution to their social media woes. Are they looking to create a newsletter? Indicate how you can help navigate people to their website to sign up for a newsletter.
Explain that you are a virtual assistant and a business owner. I would bulletize a few reasons to work with a VA, i.e., no water cooler breaks, no vacation time, no down time, no sick days, no desk space, etc.
Include links to social media sites which you have worked on or to your own and make sure it is picture perfect.
Provide links to your testimonial page on your website although some of this can be included in your welcome packet.
If you have piqued their interest, ask for a consultation.
Have your contract ready. My suggestion is not to work on a trial basis or probation period. This is what employees do.
Good Luck!
Janine