Well, did you do your research from multiple sites?
Just read all the stickies here and don't listen to employees.
Make sure to get a tank above 1-2.5 gallons, get an adjustable heater, a thermometer, conditioner, all those basic stuff. Hiding spots, and don't put more than 1 betta in a tank unless it's a divided between boys or a sorority of 4 girls or more. Sororities are more advanced, so you should learn about that in the future. Cycle your tank if the tank is not so small, and don't procrastinate when you do water changes.
Do you have any questions, non the less?