Congratuations on deciding to vape. And welcome to ECF.
Vaping is not like smoking. Take a gentle, slow, long draw on your e-cig.
New vapors may take some time to get used to vapor. It's not smoke, but vapor. When you took your first drags and actually inhaled a cigarette you likely coughed some. The same may be true with an e-cigarette. No cause for concern, your body will adapt just as it did when you first began smoking.
A FYI, the nicotine in vapor is mostly absorbed in the mouth, throat, and nasal passageways. Not in the lungs. Therefore its important to use a "mouth inhale" for maximum absorbtion. Imagine sucking on a straw in a milkshake. Use your cheek muscles. Let it sit in your mouth for a second for maximum exposure and absorbtion. Then inhale whatever you feel comfortable inhaling.
Then during exhale, exhale some of the vapor through your nose. Again, more absorbtion of the nicotine. It also allows you to better "taste" the flavor. Your nose has as much to do with taste as your tongue. Remember when you have a head cold and your nose is all stopped up? You can't taste your food? The aroma helps you "taste" your food/vapor. You may find that you taste one flavor on the inhale and another on the exhale.
Drink plenty of water. The Pg (propylene glycol) and Vg (vegetable glycerin) in the e-liquid causes dryness of the mucous membranes, leading to dry mouth and a decrease in the ability to taste flavors.
Vape as much and as frequently as you like. Your body will tell you when you've had enough.
My guess is you got the better gear than your husband. The bigger the battery the better the vape. He'll be jealous of your eGo in no time.