Do I need to pay for more than the 2 accounts
The only other thing that you would have to invest money in besides your accounts is a license for Keyclone.

What programs do I need for dualboxing
As a minimum, you want Keyclone and the add-on Jamba. There are alot of other helpful ones you can find in the wiki.

Any info you can give me would be very helpful, thank you.
You're quite welcome!