Simple sell and buy bot

I have to be able to choose the direction (short or long).For short, every time a candle close bearish, it will open a sell position. And for long, every time a candle closes bullish, it will open a buy position. The type of order should be a market order. And it has to work on any timeframe that I select on the chart.

The lot size should be dynamic based on the percentage of my capital that I want to risk. This means that I need to be able to specify the percentage of the balance I want to risk. The lot size calculation should be based on the percentage of the balance I want to risk and the size of the candle in pip. In other word, if the candle size in pip is 15pips and I specify that I want to risk 0.2% of my capital, the lot size should be based on the two variables.

I want to be able to specify the maximum number of open trades. Example, if every 15m, the bot buys and I specified 10 max trades, he won't open a new trade.

I would like to have a max spread. Example, if I enter 3, he won't open new trade if the spread is more than 3.

Last thing, I want to have global stop loss. The is really important. I want to be to set a price where I want all the open position on the chart to close. It would be even great if I can change the exit price like we do with trailing stop.