A. You can create optin forms using HTML form creator.
You can add custom fields and copy/paste the code to your 3rd party website.
A. If you add the product into your current software the members area will look the same by default. However, with a Tool Truck you are able to modify it so each membership has it's own completely unique look. You have full html and php control for that membership to customize it however you want.
A. Yes, there is a section called "Manage Email Templates" where you can create email templates to use multiple times.
Once you've added an email template, you can use it by clicking the red email icon in the editor.
A. There is a form builder, similar to Aweber, where you can build a form then get the code to copy/paste on your personal site.