Welcome to TE. Here is a few tips from Andy Pruitt regarding numbness or tingling in hands.

"Your grip on the handlebar is the key to treating cyclist's palsy and carpal tunnel syndrome. Keep your wrists straight when you grip the handlebar. Bent wrists lead to nerve entrapment and hand pain. If you are on a road bike vary the position of your hands every few minutes from the drops to the brake hoods to the top near the stem".

He has loads more info regarding this in his book Andy Pruitt's Complete Medical Guide for Cyclists. I love this book. For a new rider it provides heaps of good information on bike fit, cycling injuries and training.

All the girls here at TE are probably laughing because Im always raving about this book but it really is worth the money. Check it out you wont regret it.