You need to get to grips with these yourself as they are one of the key building blocks of the system.
I expect that you are already adding text boxes:
Administration > Custom Blocks > Edit Block - add new block using html [it is a pity - and strange - that this does not have a rich text editor].
An easy way to do this is to use Firefox as your browser and download from their site the Xinha add on.
You can then click the text field, select "Xinha Here" - type the text and style, click 'OK' and the html is inserted.
Easy.
Some of my blocks - for forms - use Flash inserted into the box.
A bit if time getting to understand this will pay handsome dividends - I use blocks in ways I did not expect when I started:
http://www.malikstores.co.uk
Any questions, put them here and you will find plenty of people willing to help. Some with much greater skill than mine, I am sure.
Best wishes
Chris