Can I upscale some how to 720 or 1080? How about might I go about that?
Yes, but not with the OSSC. The OSSC is a line multiplier, not a scaler; so you’ll be able to double that 480i signal to 960i, or apply simple deinterlacing to get 480p, but the OSSC won’t be able to reshape the video signal to an arbitrary resolution.
If you don’t want to rely on your TV to do the upscaling, you’ll need an external upscaler/processor with HDMI input.