The basic business requirements may include:

Disk space

Bandwidth

Shopping cart

Email accounts

FTP ability

Technical supportYou should make sure that the web host company you deal with provides the basic features your site will require otherwise you will end up paying for them ।
For example, for e-commerce you will have to be sure that the web host has facilities of a shopping cart and mailing lists along with a secure socket layer (SSL) certificate। Shop around and ask lots of questions. Make sure your host can meet your needs.Security of your shopping cart is of primary importance. Some large companies offer firewalls, protection against denial-of-service (Dos) attacks and even virtual private networks (VPNs) at an extra cost. You may pay more for these additional services and it may be worth it because any security lapse can undo all the effort that you have taken in building up an online business. Downtime is a death knell for an online store. Imagine the frustration and reaction of a buyer who tries to but cannot access your site or if it goes down when he/she is actually putting items in a shopping cart. The obvious assumption is going to hurt you and make you lose prospective buyers. Some of those who experience such incidents are liable to spread the word around too. To ensure that nothing of the sort happens to you, it will be good idea to check out the uptime guarantee offered by the web hosts and the technical support that it will provide in the event your site goes down.If a host offers 30 days trial. You may sign up the trial offer to see whether the company delivers their promises. Although this can mean a small loss to your business due to delay in launching your website. But it is worth it to make sure that your customers can find, use and depend on your website.