Styling the signup form

joomlamailer version:1.7.2
Joomla! version:1.7.3
PHP version:5.3.8
MySQL version:5.0.8

I want to make the following style changes to the signup form:
1. Have the field names to the left of the text field instead of in it.
2. Identify required fields i a standard way, e.g. Email Address*, where * is a required field.
3. Change Subscribe button to Submit, and change the style of it. Currently it's a long thin button, I want it sized to the word Submit. Or be able to use an image for the button.
4. In addition to Email Address/First Name/Last Name on the signup form, I have added an Interests group called Language, with two options - English, Spanish. I would like Language to be a required field, or if this is not possible, I would like the default value to be English and have that display in the drop down list without having to select it.

Any ideas how I can accomplish this styling to be in sync with the rest of my website? Thanks in advance for any help.

Update for #3 - I was able to change the button text Subscribe to Submit, but still want to change the long thin button style.

How were you able to do that?

I'd really really like to know this as well

You can edit the text in the Joomla language file: /language/en-GB/en-GB.mod_mailchimpsignup.ini