Tofu doesn't really bring taste, just texture so that's kinda to be expected. That's why I typically get firm or extra firm. I like those textures over softer ones.

I'm not sure what you mean by pressed as all tofu is pressed. That's how tofu is made. I've never tried dipping it in cornstarch so IDK how that would turn out. I don't typically do anything other than cut it up and cook it.

As for how to stir fry; I suggest looking that up. You mostly just use whatever veg and protein you want and add some stir fry sauce at the end. I haven't really found one I prefer. I don't do stir fry all that often. I really should since it's super simple.