Start by checking your sports equipment: sports shoes and outfit adapted for indoor sports. For this, ask a professional for assistance on what to get.
Remember to stretch, after every session; drink on a regular basis during the day.
Please respect instructions during the sessions, especially those pertaining to speed and slope of the treadmill which can be adapted to the shape your in at the time.
As soon as you start, monitor your breathing by breathing in and breathing out in a global manner, stomach and chest.
Keep breathing comfortably, but also feel comfortable altogether.
Place your sessions so as to workout on aregular basis from one week to the next.
GOOD LUCK.