Congratulations on the new fish!
Since the tank has yet to cycle, keep an eye on your water conditions. By "eye" I really mean keep doing water tests daily and perform 50% water changes every time either the ammonia or nitrite gets above 0.5 ppm. The test strips can give you ballpark estimates but really are far less accurate than a liquid test kit.
Here's some general betta care info, in case you haven't seen this sticky yet: