5x4 room with mylar on walls. 600 hps. flood and drain.
More light or less space. Flat white is better than mylar.

4' of space from light to flood table
You need to be able to adjust the lights or the plants or both, so that you can keep the light a few inches from the plants, or as close as possible without causing heat stress.

in the veg room i have a drip system using rockwool.
My condolences. RW is very hard to work with IMO.

1 im new with floranova what is a good feed program in veg with the floranova grow?
The same as all nutrients, start at about 1/4 strength after 2 weeks (or 5 nodes). Gradually increase each feeding until you see the first signs of nute stress (brown leaf tips or edges), then back it off a notch. It's different for each variety, some need twice as much as others.

2 should i ditch the 4x4 rockwool and if so what size pots for veg then for bloom?....
I would defiantly ditch the rockwool, or you can have my half bale that's been sitting in my shed for 6 years. Why not stick with one size pot from start to finish? I use expanded clay pellets (Hydroton) and 6" net pots.

3 with my setup [switching to pots]what is the most productive/yielding way of configuring the table? 4 big plants 8-9 smaller ones or a bunch of popsicles?...
Depends on your growing method. If you flower soon, you use more plants per space. If you flower normally, depending on a bunch of stuff, you'll want 4-8 plants in that space. I veg for about 2 months under a 400W MH, then flower under a 600W HPS supplemented with 10 or 12 28W 5800K CFLs, in a space a little smaller than 3x3 feet. I usually do 6 plants, and top once or twice. You need good ventilation for this. I have dedicated ventilation just for my cool tube, and more for the grow.

4 is there anything you guys can think of that im not
Yeah, lots. Just practice.