Thanks for the green!
First start with a porous tip...milk dud, sniper, or black kamui. Then shape it to a nickel (if you have a 12mmm or larger) or a dime (smaller than 12mm). Always keep it well manicured (these tips hold their shape well) and you will be able to get all the english you want without fear of miscuing. Oh, Blue Diamond chalk helps too!
Take care,
Randy