Email Marketing Newbie

Hello everyone, basically I am new to email marketing, dad's given me a database of 500,000 fresh emails of UK based businesses. I just don't know what to do with this e.g. software, content, etc.
I'm 18, and I've just started an accident management and vehicle hire business. So if anyone has ideas on what I could possibly write, I would highly appreciate it.
Regards,
Armaan

See original post by Armaan Ahmad