Here's you should always look within the hosting plan :
Disk Space
Estimates your disk space, one html page usually +- 150 KB, 25MB Disk Space = 166 pages.
Bandwidth/Data Transfer
How to easily calculate bandwidth you need. First take size of all pages and images/multimedia in your web site. Let's say it 50MB then how many visitors to your web site? Maybe you estimate it would be 10000 visitors per month, then bandwidth you need for is 50 x 10000 = 500 000 MB = 500 GB Data Transfer/month. There're a lot of web hosting plan with unlimited bandwith package :).
Domain Name
If you don't have any domain name yet for your web site, you should see if web hosting package include domain name registration. Usually they include it in their plan. Average cost to register a domain name is between 8$ to 12$ per year.
E-mail Account
You need it as identity for your website, ex. you@yoursite.com, support@yoursite.com. You should see how many e-mail accounts provided for your web site. Additional features on e-mail account is E-mail Forwarding, E-mail Autoresponders, E-mail Aliases.
Control Panel
If you don't like FTP to upload your web sites, then you could upload it with control panel upload menu. It's easy and simple job to upload. Control panel is a web page to control your hosting account, add e-mail accounts, see statistics of your web site etc.
Database
Did you need database? If you're using built-in script/CMS like mambo, joomla, PHPNuke, Forums like VBulletin, phpBB, or shopping cart, etc. then you need database for your web site. How many database you need? for all scripts above usually you just need 1 database account. Another consideration is how many space is for your database. I found two kind of database space offered by web hosting company, first they include it in your web space (web space = web space + database space) other is they specify space for your database.
