I'd count what you are eating in a normal day then go from there. I used to eat over 200 grams of carbs a day. Now I eat around 80-120. I find days I get closer to 80 I lose better, days I happen to get 120 or more grams I don't lose or can even go up on the scale.
The key is to just get into ketosis- you don't need to go all the way down to less than 20 grams of carbs a day to do that. I find when I'm under 100 grams (80-100) I am in a light state of ketosis and that's good enough for me
Brown rice isn't going to kill your day but I'd shoot for no more than half a cup of rice.
I track my calories and carbs and for me the goal is to do meals that are 25 grams of carbs or less a day, that doesn't include my daily snacks, which is how I'm able to get under 100 grams of carbs on a normal day.
Walmart sells Ketone strips for like $7 for a box of 50 if you want to see how many carbs a day gets you into ketosis.
I read somewhere that a light state of ketosis is enough to get your fat burning - extreme ketosis isn't necessary unless you are trying to lose faster, and I'm happy at my pace.