I am new to business start-ups so just my novice reply.
The best thing which you can start doing is setting up your website and promoting packages directly on the website. The promotion of your website through search engine optimization might consume some time. So it is best to start promoting your website online.
Hi,
all the best with your new business, I think the very best advice would be to invest in the best possible website you can afford as it really will pay for itself in relation to the business it brings in. On second thoughts the best advice would be to read how badly let down by BT people have been on this and other forums and find other providers.
Steve