EA/Robot for a Chaining Strategy (Spread Betting)

I'd like to develop an Expert Advisor which will create chaining small orders at set intervals around the current market point, and the orders are only created within a set range. This is specifically for MT4 Spread Betting with Pepperstone, trading indices and metals.

An illustration is as below, using Hong Kong's Hang Seng Index as an example:

• When HK50 index is currently at 18946.4, I'd need to create 3 limit orders below this point and 3 stop entry orders above this point. The number of the bracketing orders is Parameter 1.
• Stack for each order is £1. The stack/contract size is Parameter 2.
• The internvals between each order is 100. Thus the three limit orders should be 18900, 18800 & 18700; and the three stop entry orders should be 19000, 19100 and 19200. This interval between orders is Parameter 3.
• Starting point offset has a preset of value of 0.0. But it shall allow changes like ending with a set digit, e.g. buying at 18950. This is parameter 4.
• Take-profit for each point should be 100 points away, e.g. Buy at 18900 and Take Profit at 19000. This take-profit interval should follow Parameter 3.
• Therefore, profit taken for each order is £1 x 100 points = £100
• Stop Loss value is Parameter 5
• When the market price moves, new orders of the same pattern above should be created, but NOT duplicating the existing orders and active positions. Say, when the market moves to 19001 now, the script will check if there are all six orders/positions that cover the set range. It should now create a new stop entry order, buying at 19300 and take profit at 19400.
• This should allow the strategy to run for Long or Short mode (Parameter 6)
• The above strategy should keep looping when HK50 index is between a lower limit (Parameter 7), e.g. 18200 and an upper limit (Parameter 8), e.g. 19700. It should not create any orders when exceeding this set range
• While Parameter 6 and 7 can be input manually, it should also be able to opt for linking to Bollinger Band's (BB) lower level and upper level. The BB should allow input of Period, e.g. 14 (Parameter 9), and deviation, e.g. 2 (Parameter 10).