It is bad that we have version 1C of 7.7?
Judging by the wording of the question you are thinking about the possibility of changing your accounting system? If so, the need for the development of the site in General may diminish.
There are dozens of ligaments the online stores with popular commercial configurations in the eighth platform for when you want to keep the site on your own hosting. In the case of Bitrix, this bundle is the default for many years. For any of juml and WordPress heaps of already written plugins.
You can sign up for the shopping portals type prom.ua who themselves distribute integration with 1C to upload orders and download the catalogs and price lists.
Or even, you can choose the middle option - to rent a complete infrastructure for the online store from 1C:UMI with the design ready, adjustments and work exchange with 1C.
Suggest to consider all options in the market and to compare the cost of their implementation in your business compared to your planned development of their site from scratch and integrated with your 7.7