Use the "ghost" effect. When the ghost effect is 0, the sprite is visible. When the ghost effect is 100 it is invisible. Under "Looks" find "change [color] effect by [ ]". You can click the down arrow next to "color" to choose "ghost" as the effect. In one project I wanted a slow fade so I used "Repeat (50)" then "change [ghost] effect by (2)" then "Wait (0.1) seconds". And I put "Set [ghost] effect to (0)" at the beginning of the project to make sure the sprite would always start out fully visible. (I tried the Scratch Blocks below for the first time, but I'll have to practice using them....) Good luck!
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