KiCad only uses pin numbers to match pins on schematic symbols with pads on footprints. There is no intermediate indirection layer at all in KiCad (some other programs do this, for example to match a symbol with different footprints (I.e. DIP and SMT, which often have pins in different locations). “Pin numbers” in KiCad are alfanumeric strings, so you can use for example “chessboard” coordinates such as common in BGA’s.
You have not shown your footprint. changing properties of pads is quite straightforward, you can either edit their properties or simply move or drag them. KiCad also has options to create an array of pads and to push pad properties to other pads to for example change the size of a lot of pads quickly. I find using the footprint editor quite intuitive. The quality of the symbol and footprint editors was one of the reasons I started with KiCad. Their UI is pretty similar to the schematic and PCB editors.
Again: Component like what? You have not shown any info on what part you want a symbol and footprint for.
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