First of all you have to survive without loss all your fund.Risk control strategy must be first priority before u start trading. I 've summarize that thing for u.

Step 1 : Set your gain target / period you need.With this formular help u estimate how much capital u need to reach your target.

T = Target per period
%risk = how many acceptable %risk.
Capital = How much capital u have to invest to reach target

Capital = T / %risk

Ex: You expect 1000usd per week and acceptable %risk = 10%

T = 1000 , %risk = 20%

So Capital you have to invest = 1000/20% = 5000usd

Or incase you dont have 5000usd you can reverse calculation how much target per period from your capital . Suppose you available to invest 500usd

T = Capital x %risk
T = 500 × 20% , T = 100

That s mean you can earn maximum profit 100usd with take %risk 20%.

Step 2 : Base on your acceptable %risk to calculate maximum Lot size you can take.

P = pip deviation per period (timeframe)
pv = pip value by product.That s mean price movement 1pip how much you can talke profit/loss (Base on 1lot)

Lot = (Capital x %risk)/(p x pv)

Ex : You trade gbp/jpy and ATR(14) timeframe week value indicate 4.00

P = 400 pip
Pv = i suppose average pip value of all product = 10usd / 1lot

So maximum  lot size you can put = (500x20%)/(400x10)

Max lot size (bullet) = 0.025

Think about worst case scenario once you take wrong direction trading you just loss (max lot x pv x p) 0.02x10x400 = 80usd = %risk 80/500 = 16%

This can stability your emotion while trading and you have time to take action like a cut loss before wrong direction movement reach 400pip. May be you cut loss @ 200pip then you can fight again with stable emotion.

Positive scenario your trading on right direction you can earn 80usd = 16%

This is just the basic trading strategy you have to calculate before trading. Once you have your trading strategy to make profit like a improve entry/exit accuracy you may success on trading life yourself.