I want to purchase the professional version of Salesforce although I have a question about the limitation of sending out mass emails using the apex calling.

For example, I need to send out emails to leads from the Leads CRM database which are customised (first name, last name, company etc). These objects are pulled from the CRM, but I can only send 10 of these emails at once?

So for the limit of 250 per day, does this mean I need to send 25 batches of 10 emails?

Is there anyway I can send 250 in one batch?

We have created a custom button on the Lead record to be able to easily send Lead information to non-salesforce users/Partners.  Where do I locate the link to the new email template so that I can link it to the custom button?