Hi! My name is Serg. Good question. Firstly I recommend to define your target audience. As far as I understand it's a companies which need video conference service under their domain. Let's answer few questions: what the size of this companies? Which industries? How many offices does they need to have? Why they need to have this service under their domain? Why they couldn't use third party solutions?
After you define target audience you can find the best way to reach them. Basically you will use:
1. Outbound activities (cold calls and e-mails)
2. PPC search advertisement
3. Social network promo
4. Conference/meetups/webinars
5. Co-branding sales (with different services which served your target audience (i.e. you choose small companies and they mostly use third party crm - you can collaborate with crm-companies).

About pricing: do you know your competitors? their prices? you unique sales proposition? Do you make customer development to learn you target pains?

If you want to learn more about it please let me know.

Serg.