You can remember the meaning of 出来 with this easy mnemonic:
An urban legend emerged long ago saying that if you light one hundred candles and then blow out (出) one candle after telling a ghost story, a real monster will come (来) once you blow out the rest of the candles later on. The legend probably emerged when parents tried to scare their children so the children would not play with candles!
Using mnemonics to remember the meaning of Chinese characters like can have an enormous impact on how long to learn Mandarin it takes.