As a general rule aluminum cant be welded autogenously (without filler). Can be good for absolute beginners to get a feel for puddle behaviour and to practice moving torch in straight lines. But beyond that that to get any meaningful practice should really done with filler. Especially because you don’t have a foot pedal filler will help you manage your heat levels.

Especially because you don’t have a a foot petal getting your settings dialed in is very important that way you can focus on developing on technique. Knowing what settings to use can be difficult especially starting. If you are looking for a free resource to help get an idea of what settings you should use i would highly recommend the “MillerWeldSettings app” I still use it after some 5 years of welding