Adding turkey should be fine! If its raw turkey, be sure to let it cook enough!!
Thats the good thing about indian curries. Its all about the base, once you have that, you can add whatever you want to it! Thats what makes it so versitile, and as for the chutney, i would use 1 tomato chopped up, or you can use some tinned chopped tomato, but fresh tastes better. Again experiment. Add 1 tomato and taste and if you feel you want some more add another half!
Me and my mom never measure anything. We just go by our eyes and dash everything in. After so long you get an understanding of how much of which spices you prefer. Good thing is if you get it a tad wrong and add a bit too much of something, the most thatll happen is that itll either not be spicy enough, or itll b too spicy!
But for the chutney, when you buy a bunch of corriander from the store, use the whole bunch, cut off a bit of the bottom stem (about 1cm) dont throw the rest of the stem away, it gives it a lovely taste. And to that add the 1 tomato. This will probably give you a small tupperware tub full of chutney and this will last for about 2 weeks.
Just remember if you are storing it, give it a good stir before you use it again and store it in the fridge.
Let me know how you get on! And do post pics! I'd love to see how other peoples food turns out