Automatize a sheet using formulas

Need help with formulas in excel
This is a trading model that says when to buy, and when to sell a stock. Need help with automatize the process with calculating the returns of the trades.

The workbook consists of two sheet, need help on the second sheet. The second sheet import value from sheet one (which is only pasted as values here). And tell when to buy a stock and when not too.
When the stockprice occurs in column B (when it exceed a certain level in sheet 1) we buy, and sell when the price again occurs in column C (when in comes within a certain level in sheet 1), and in column F I calculate the return for the trade. Any suggestion for how I can use formulas to automatize of the process in column D, E and F?

Let me know if more details are needed to suggest a solution.

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