Well....in my brother's old GT, I would just heel of my foot to work the brake the the toe to work the gass. Use your left foot work the clutch. If you get good enough you can bang into 2nd or 3rd(if you've got enough hp to spin 3rd)
OR you can just rev it up, dump the clutch, then jump quickly onto the brake. Do what ever works best for you.
BTW, with you stock gears, do a 1st gear burnout. You don't have to do a long one, just enough to haze the tires. About 5-7 seconds