How do I transfer my site from localhost with MAMP to dreamhost?
If you can back up a copy of your domain directory, transferring to DH from MAMP should be much like transferring from any other host.
Here are some Wiki articles that may be helpful to you:
I also found this tutorial about transferring from a local host to a live one:
Hope this helps! If you have any trouble please contact support and someone will respond ASAP!