stop loss/break even

how to move stop loss to break even ?

close the trade when say , 50 pips profit is made, then start another new trade using the price+1 at 50 pips profit ?

this this better or use trailing stop better ?

You should not need to close the trade, you just adjust the stop order with your broker. I am assuming you are using MT4, but if not then the process should be the same - go to modify or delete order and change the stop loss to your entry point.