Can you get into any more detail about what you'll be doing? Just curious. It's not the most encouraging thing to see someone going into a "pure health profession" who literally has "no idea about diet and exercise." If we could fix that ASAP, that'd be good.
When most people first switch to a low carb diet, they usually see some decent immediate weight loss. What did you weigh last month before you started?
What does your lifting routine look like - the days, exercises, sets, and reps?
What are your exact goals? I'm presuming you want to drop fat? If so, some cardio would be a no-brainer. Odds are your lifting program could use improvement. Your total daily calories could also be too high, even if you're going low carb.
Glycemic index is to food as Rob Schneider is to comedy. Basically a non-issue that's not worth paying attention to.
Really though, there's not much specific advice to give since we don't know what you're doing now. You say you're lifting regularly and eating high protein/low carb. That by itself is a decent template to get into shape, so without seeing the particulars, not sure what to suggest other than look into a program from the Archive and follow that instead of doing your own thing.