I'm not going to say a lot about custom blocks. But I will show you some really simple ones to give you a flavor. There's a lot I still don't know about custom blocks, and that fills many posts on the Drupal web site. One good starting point is: Blocks.
A business or support group should always let people know how to contact them. One easy thing is to include your mailing address on your pages. This is about the easiest kind of block to start with.
Administer>>Site building>>Blocks. I should already be sitting on your default theme, but if not, select the right one.
My company name<br>123 Main St.<br>Mytown, State Zip<br>USA<br>(123) 456-7890
That wasn't so bad was it?
It is fairly common practice, especially on a group site to let the visitors know when the site was last updated. This example requires you, the webmaster or administrator (sometimes called the "super user") to maintain the block. There are ways to automate it, but I leave that until we are all farther along in our Drupal education.
<address>Feb. 12, 2007 - NEW</address><br>
<small>Best viewed in a full window with Internet Explorer 5.5 or higher. Tested with IE6, Netscape 8, and Firefox 2.</small>
<front>in the pages box.
Okay, now you're an "expert" on blocks.