Hiya! Just thought I'd jump in here since I've been taking care of betta's for about 3 years now, there's nothing necessarily wrong with the air bubbles, it'll just create a mess in your tank and most likely will mess with the water parameters of your soon to be aquarium.
The water test kit you get should cover all of your water needs, however, if you are on a tight budget it isn't needed. I haven't needed to test my water the whole time I've been taking care and breeding betta's, the only time was when a poor fella got dropsy. They are very hardy fish, don't underestimate them! Also, I noticed you were getting Java Ferns, be aware they DO NOT like to be put in substrate/dirt, that would cause root rot for them. Hope you can get your little buddy soon