Tick charts are most commonly used for scalping. Apart from that I would recommend you to follow 15 minute charts in case of day trading. And yes Stops are very important for forex market, like, in some currencies for example: EURGBP, GBPJPY are very much volatile, on account of some event they easily move 6-7 pips so better to get hit by margin call, I would recommend to go for stop loss as you will get more opportunities ahead to make money. To place stop loss take help from indicators that suggest good support and resistance, like Fibonacci. Also you can use different methods to determine where to place stop loss like percentage method, support method, moving average method.
Percentage method: In this method you must decide the %of risk you are ready to bear and set a stop loss at the point where the value is (%of risk x market price of share).
Support method: this method can be used if you are able to find the recent support level of the stock. You need to set the stop loss just below the recent level of support to provide it some room to trade before pulling the trigger.
Moving Average method: in this method a moving average can be applied to the stock chart and stop loss can be placed just below the moving average, reason being same to provide some time for stock to trade before exiting the trade.