There really aren't any filters to do that. Normally you'd want to get your mic closer to your mouth, so your voice is louder, then turn the level of the mic down to exclude the further (and therefore quieter) audio of the typing and handling noise.
If you're using a condenser mic, be aware that they're meant for use at ranges under 12 inches from your mouth, and are designed to pick up EVERYTHING... meant for use in a recording booth, not in a noisy environment with typing and the like. Definitely not meant to be sitting on your desk, as it kind of sounds like may be the case if you're getting that much handling/transmission noise.