Any tooling supplier will have tools like that - you can look in my Links section under Tooling for them. For aluminum, you need 2 or at most 3 flutes for chip clearance. Order them by the shank size, which will need to fit the collets you've got. Don't get tools that are too long to clear the workpiece when the machine is at the top of its stroke. You need ball-end tools for finishing 3D contoured surfaces, but for finishing flat surfaces a flat-end tool works best. For drilling, if you don't have a Jacobs chuck, you'll need a set of drill bits with a uniform shank size, so they'll all fit in a collet.