Recipe question

HI. I live in the US and have to change all the recipes from grams to cups or teaspoons. I just pulled up the Dollar cookie recipe. It calls for 1 small glass of rum. I tried using a shot glass but then had to add more of the dry ingredients. Does anyone know what 1 small glass is equivalent to? Also, if the recipe just says to bake something, I'm assuming a medium oven like 375 degrees? Thanks!