Pending Order EA or Script is required

A Pending Order EA or Script is required to open the first position Sell or Buy and place 20 sell or buy direction limit or stop pending orders with desired gap.First position lot size and each pending order will have a different lot size that we want to keep like 1st position lot size,1st pending order lot size, 2nd pending order lot size, 3nd pending order lot size, 4nd pending order lot size up to 20.