Lot size choosing tips:
1,Trade risk should be 3 to 5% on every trade.
2, lot size should be choosed based on stoploss pips not by profit pips
Example : capital is 1000$.. then u r risk capital is 30(3%) to 50$(5%)
Formula choosing lot size : (Risk capital/ stop loss pips) *0.1 : lot size
Example : risk capital per trade :50$ , stop loss pips : 60 pips
Lot size (50 $/60)*0.1 : 0.08 lot
it is common rule . but risk should be 3% to 5% for any currency or cfd or equity.
cross pir has different pip value.