You need to purchase two things if you want your own SSL Certificate on your domain.
1) Purchase an SSL certificate from a reputable source
2) Purchase one static IP for your domain for your account for and additional cost per month.
After purchasing above features we can install certificate on your domain for you if you choose.
To have us install:
Open up a support ticket titled SSL Install with the following information:
Primary SSL Email
Key Size: 1024, 2048, 4096 bits (ask your SSL Provider)