Here are instructions to care for your bonsai: https://www.bonsaiboy.com/catalog/indoorbonsaicare.html
I had bonsai's for many years and the key was misting them 4 times a day with a very fine mister. I took them to our local bonsai master yearly to have the roots cut back and training the shape.
Here's a good video on bonsais for beginners: https://www.youtube.com/watch?v=wGBe0oII0U0
Water once a week keep in med light