BRIANNA8CD'S PROFILE

i'm using Rpg Maker 2000 and i've spent all day looking for a tutorial on how to make a custom sprite. I've made some on websites, but after i've customized it, i have no idea what to do next.
i don't know the dimensions, and all the other tutorials i've seen are for Rpg maker XP or something.
it would be nice to get some help on what to do after i customize it, like do i take a screen shot of it, or make it in photoshop? do i convert it to PNG? D: please help.