Am i doing well

I have been vegging thes BB's for almost a month. I just transplanted and moved them upstairs using a 600hps to veg 18 hours a day. Im using 3/4 strength veg. nutes and watering 3x a day with ebb n flow setup. In a week or so I plan on taking cuttings from each and using my bottom fluero's to flower and determine the sex. I could do this or just take cuttings once they start flowering as soon as I find the females. Which of these methods would be better, and what could I be doing better for my overall grow.

Well, under the 600, those are going to grow very quickly. I don't imagine that you will be able to veg them for a month, but if you can, then take the cuttings, and sex them. That makes all of your decisions easier.

The Blueberry is mostly indica, but is sometimes difficult to root. Take a couple from each plant.

HTH