Create a php page with a form on it.
Insert -> Forms -> Form
Add the needed form elements using the insert -> Form menu
for the attachment, add a file field.
after adding the form elements, double check the form tag to make sure the forms encoding type is set to mutipart/form-data
Now add universal email:
WebAssist -> Create Email Message
for the body, select the option to use a file to manage the email, this will create an email tempalte that will automaticlyt loop through the form fields and add them to the message.
for the attachment, click the paper clip icon in UE to access the attachment settings, choose the Submitted file option on the attachments tab of the UE behavior? and select the file field.