First and foremost, enjoy. It can be hard work at times but it should at the end be what you want to do.
A bit more specific.
Nail down the fundamentals. There's a standard format for position/departure/arrival etc radio calls. Get them in your head now so that when other things demand your attention, it's one little thing that's easy.
Don't get carried away by the flash looking equipment in todays trainers. Future airline pilots don't need to learn on glass cockpit Cessnas with integrated avionics etc. Pilots need to learn how to fly. I've had many occourences in Boeing and airbus where the technology is tits up and attitude flying is the order of the day. same as i did on light singles. attitude and power is all you need. the other stuff is just window dressing.
Ask questions. Nobody has ever died of embarresment. If there's something you're not sure of, ask.
Make sound descisions. Not necessarily perfect ones but base your descisions on good info and good practice.
Have fun
DT