Just go to a sporting goods store and get a basic pistol cleaning kit with rods, patches, attachments, lubrication, solvent, etc.
~$10
I'd also invest in a can of spray solvent. It is really good at flushing out grime. ~$8
Also most basic kits do not come with a barrel brush that fits your pistol. I'd get a nylon or some other synthetic type of .40 cal brush. I don't get the brass brushes because they are too uni-purpose and cannot be used on all barrel types. The synthetic brushes you can use universally.
~$1
Optionally you can get a set of brushes and pics in the same aisle to scrub the frame and slide for about
~$3.