Wherever I have seen a pickle added, its mostly towards the end. In terms of how much is down to your preference I guess, but more than teaspoon is going to make the dish hot! Again with the chilli powder, its your choice but if you like me, i'd start with small amounts and work up.
I have just bought my first jar today and am about to open it, if i'm not back in 5 send the fire brigade round please!