You will need at least 8 XLR inputs. If more than that, much better. Try to consider getting a Zoom R16 audio interface. If you're a Behringer guy, QX2442 is fine.
At least 8 tracks that works simultaneously. But for starting, 4 XLR inputs is enough.
Don't think too much of the Output port since USB port interfaces works well to have it recorded on your DAW, unless you plan to add a studio monitor.
Effects, pre-amps, etc can be manipulated through your DAW of choice.
Now this, if you plan on recording with only 4 mic setup(Snare mic, Bass Drum mic, and 2 Overhead mics) which is the very basic and good for starting up, consider having the Behringer QX1204usb. I started with it too before upgrading to Zoom R16.
Bottom line, you'll need not just an interface/mixer, you'll also need a DAW(Digital Audio Workstation) and a number of drum microphones and XLR cables.
With regard to drum mics, Shure's PG series is a good start. Or maybe just buy the Shure SM57 for Snare Drum mic, which is the most versatile snare mic. Shure Beta52a for Bass Drum mic, one of the favorites as well by most drummers(Audix D6 is another great choice too). And a decent Overhead mics. Behringer C-4 is where I started. Small but terrible condenser mics for overheads.
Hope this helps.