Stocking a 12 gallon aquarium (12 gallon Eclipse with heater and included filter.?

I am going to get an eclipse 12 gallon aquarium and I’m also going to buy a heater. The substrate is going to be sand and it will have live plants. Here’s my stocking plan. 6 albino cory catfish, 2 African Dwarf Frogs and a veiltail female betta. I already own the betta and need to get it a new tank because it’s currently living in a 1 gallon tank with an air pump, rocks, and decor (I understand this is an improper tank, but as of right now she’s doing fine. Would I be overstocking my tank and/or placing incompatible fish in the tank, I want them to be happy. Also I can’t what heater to get. Should I get 50 watt or 100 watt? Please give me a link to a HIGH QUALITY heater under or around 50 dollars. Thanks and an additional advice would be extremely helpful as this is my first tank (except for the one I have the betta in and I don’t call that a tank). which fish should I use for cycling and after cycling what order/how should I introduce my other fish? Also How do I convince my parents to let me get it. They don’t know I want this yet because im not sure how to approach them about it. Parents, what made you let your kids get a fish tank? Teens, how Did you convince your parents to allow you to have the tank? I plan on buying everything my self by working at my parents restaurant and I currently take care of my tank all by myself and have plenty of room. I think they’re just gonna say you don’t need any fish at all mention it again you’re grounded. Thanks for reading the long question extra tips greatly appreciated!

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