Transfer Application How to??

Hello, since I’m not familiar with the transfer process that I have to undergo this summer I’d like to ask you for how to do it.

Should I transfer after getting an acceptance letter from another college while attending the current school? (or is that even possible to attend one university and report to the current university that I quit and transfer?)

Or should I drop out first and take a year off while I write up my transfer application? In easy words, should I put myself into a similar situation to the fresh off high school graduate?

Currently a sophomore, I wonder how the chance would be as I have not made my decision earlier as a freshman in which most of my friends who I know that transferred dropped out and went to a different school

Please help me. Confused.