How do I determine my position size???
I assume, you are asking how much share you should buy?
Well, it depends on your capital , risk ratio and stop loss . Say for example your capital is 10 laksh and risk ratio is 1 (should be 0.5 to 2) then your max loss for each trade is 1000 Rs. say for example a stock at 100 rupees and you set stop loss of 95 then you should by 200 shares, that is 200 X (100-95) = 1000, if you hit at 95 then exit the trade or get profit 
Could you please elaborate your question?
If you provide a clear and detailed question, you will get many answers.
Otherwise ppl would try to skip answering your question.