I'll keep this simple
At 30% bodyfat you are fat, obese even.
I'm your height and 218 in my avatar so that should give you some idea.
As you are new to lifting you are in the magical era of noob gains, you can (and should) cut and you will still make gains.
Don't cut on 900 calories that's just idiotic, 2200 or so calories is what you should be cutting on
If I'm you I'm going on a 3 month cut, use intermittent fasting and lift as heavy as you can, then after that review your situation, you want to get down to 220 probably even lower than that before you even think of bulking. Do not add extra weight to an already overweight frame. At 6'3" 210lbs you still wouldn't be close to underweight, I've been in the 190s before when I was at my leanest and I was still "big"
You don't worry about bulking until you hit 12% bodyfat