Don't feel bad. I've done a lot more than that and not seen this exact problem either. Let's recap a little and see if we can figure out where it went sideways.
1. You created a completely new site in Joomla 2.5
2. You installed all new plugins of the right version in the new install.
At that point you should have had a completely functional Joomla 2.5 site. Correct?
3. You uploaded a template and got the site working with the new template. And at this time you still had working site? Correct?
I'm a bit confused on this point:
This was in a 1.5 template... BUT I did NOT migrate the site to 2.5.. I did this site transfer manually. set a 2.5.6 fresh install. copy the file (html coding) to a new file within the 2.5.6 of the same name and saved it..
If this was a new installation, what is it that you moved?
Was all the data previously in a 1.5 site and you moved it to this site?
What exactly did you copy?
Or did you enter all new data?
This is also confusing:
Once I did that I changed my config.php file to mesh with the my SQL folder in my PHP Admin. That done I went to login and came away with the following error:
Which database are you trying to connect to?
Sorry for all the questions, but we came in the middle of the problem. I suspect that there was an error in procedure, but I don't know what you've done or not done.
When you said you wanted to add the plugin table that's what made me suspect there was a problem in the upgrade procedure, not necessarily a problem with Joomla. Can you help get us on track?
Thanks,
Ed