Hi Skoot24m
Well, congrats on your betta, careful they are additive!!
I have seen those betta sphere's with the nice light, but they are pretty small overall. You will need to change water very often, at least twice a week to keep it from getting murky and making Mr. Betta sickly.
A larger tank will also allow you to add some fake plants, so Mr.Betta can have some hiding spots.
Shoot for a 2.5 to 5 gallon tank. Anything over a 2.5 gal tank can be heated(5 to 10 w per gal heater). Just keep your eye open for garage sales or ask your relatives, you will be surprised how easy it is to find good sized tanks kicking around peoples basements or garages.
Betta's are tropical fish, so they depend on ambient water temperature to maintain their internal body heat. 76F is ideal, but anywhere from a steady 74 to 78F is fine.
I agree about the snail.. they can make a good mess pretty fast, and that small space will get dirty quickly. If you get your hands on a large tank, you can keep the snail to control algea. Snails tend to reproduce quickly... so you will likely end up with dozens after a while!
Most betta/staple food is fine for daily feedings- whatever he will eat. Try a variety of foods, like frozen blood worms as treats, just so your more likely to give Mr. Betta a good mixture of nutrients and minerals. My adults LOVE frozen brine shrimp, they literally jump out of the water to get it!
Just a heads up.. most boards/users will suggest a large tank for the long-term health of your betta and because it is easier to maintain a larger tank than smaller tanks, with less frequent water changes and more room for mistakes.
Welcome to the board!