Well back to the subject. I've gone through dozens of gerbils in my younger years. My mom used to breed them and I always kept a pair as pets.
Fruits and veggies are a treat at your own risk. I never fed them because it was too much of a risk for wet tail. A better treat is a piece of cereal or any of the assorted grainy treats you can buy at the pet store. Food should contain little to no sunflower seeds. Gerbils are treat deamons and sunflower seeds are a favorite. It takes little food to sustain them each day and if they can they will live off of treats and sunflower seeds and not touch anything else. They learn quickly whether or not you are going to give them enough treats to sustain them.
Bedding is easy. Give them toilet paper rolls or soft drink cup holders and they will chew their own bedding. No cedar or pine bedding and nothing with ink on it. Make sure it stays dry all the time. If the water bottle leaks on the bedding you need to put a dish under it or constantly clean the wet bedding.
If you get more than one and you ever need to seperate them, don't keep them apart for more than an hour or two. This is very important as I had one gerbil bite the tail off another after being seperated for only a few hours.
If you get the plastic tubes for them to run in, check the connector pieces often. They chew them from the inside and can escape before you notice that they are chewed.
They bite. The don't get as tame as hampsters. They like to bite. They might love you but get annoyed one day and there goes a fingernail. Have bandaids nearby.
I don't think there is much else to say. I'm sure you got all of this information already through research, but its worth repeating.