Would this case fit an optical drive?

Yes, it would fit one standard external drive, such as a DVD-ROM or Blu-ray drive.

I'm planning on putting 2 120mm fans on the side and I was wondering if they should be intake or exhaust?

With 1 120mm in the front as an intake, and the preinstalled 80mm exhaust, it might be better to have the bottom side fan as an intake and the top side fan as an exhaust to create some local airflow for the GPU.

Is the power supply a standard ATX power supply? Does anybody know the wattage of the power supply?

It'll fit a Standard ATX power supply (PSU) , and doesn't come with PSU. But, if you plan to use it with motherboard that has a APU (onboard video connect) , or low end GPU, that doesn't need additional power, then you should be ok with a 430 PSU Hope this info helps : >

Difference between the T1 Plus and T2 Plus?

They , Zalman cases, both are fundamentally the same, other than the T1 case has the panel connect in the front, and the case color is black coating . Whereas the T2, has the Panel connect on the top of the case, and has a front panel in a Piano Shinny black. I have the T2 and really link the shinny Piano Black front Panel, and the panel connect on top makes it easier to connect to external USB’s , head phone, etc.. Maybe you can find out more by looking at their Zalman web site Below: Hope this helps : >

Does this come with a fan?

It comes with one rear exhaust fan

ZALMAN T2 Plus Black ATX Mini Tower Computer Case Compatible with Standard ATX / ATX 12V Power Supply

ATX Mini Tower
1 x USB 3.0 / 1 x USB 2.0 / Audio Front Ports
Compatible with Standard ATX / ATX 12V Power Supply
1 External 5.25" Drive Bays
2 Internal 3.5" Drive Bays

🔥Don't forget your OS, we have Windows 11 OEM, Download and USB versions available

ZALMAN T2 Plus

The ZALMAN T2 Plus helps you build a small form factor powerhouse without compromise in performance. It accommodates up to micro ATX motherboard, up to four case fans (one preinstalled), and up to 300mm long graphics card. Efficient cooling is guaranteed by bottom-placed PSU design and ventilation holes on the front panel. The interior features black coating and cable management system. Complemented by its minimalistic exterior, the T2 Plus gives a clean look from inside out.