Most of the discussion about this printer (including a fix about a recently discovered shorting (possible fire?)-hazard) is happening at the Google Groups forum, so if you want some of the latest news/tweaks, check there:

https://groups.google.com/forum/#!to...ao-printer-3d/

As for a general starting guide however, look here:
http://3dprinterbrain.com/pmwiki.php/DupI3/DuplicatorI3

Definitely look at the "Recommended Mods" page, and if you want, some of the ones on the "Extra Mods" page can help improve the quality as well.

Just keep in mind two things.

First, that several of the ones on the recommended mods page have already been performed on newer printers shipped out (Such as Z-axis dampners, having the extruder fan on always-on, and adding a fan to the control box, but check to make sure yours does have these) and that the pages for the DI3 on Printer Brain haven't been updated in a while (Most importantly, the shorting hazard of the crimped connections, HIGHLY recommended you perform that fix first before using it).

I am currently working on performing the last of a few modifications to mine before using it for the first time, so feel free to ask any questions as well.