can somebody help me?

i want the simple ea like;

1. buy in current time,

- 15pips stop loss for current position
+ 30pips target for current position

2. then double lot size from previous position, open sell stop at stop loss in stage 1
-15 pips stop loss
+30pips target

3. then double lot size from previous position and open buy stop at stop loss in stage 2
-15 pips stop loss
+30 pips target

4. process would continue untill the target is reach