Heres an idea if you want to do custom stuff but dont have any type of pads or keys.
I dont see what you have access to or interface,
but if you have a mic or anything that will record to an audio track,
--set it up to record you beating on a desk or any hard surface that a mic will pick up, (maybe even thumping on a guitar.
--once you have recorded that, bring up audio snap by selecting the track and hitting the "A" key
--you can select the "Copy as MIDI" and paste that onto an "Inserted" Session Drummer track or any other Synth track you wish.
--Then assign all those notes to what ever drum component you want
In the end its just about getting what you are feeling converted over to a music tone
It would help if you could post your system in your signate-Computer and interface with specs, etc...
Let us know what ya think