To Earn TBT: Go to the forums page go to animal crossing new leaf or whatever it is since there are interesting topics there
you can get big amount of tbt depending on how many words you have so the longer and bigger? The richer.
The sidebar where your fc is says Bells: thatsyourTBT or click on Currency and it will show you how many you can also to give/donate tbt like with deals you go > currency > bells:7 > to: mobcoffee , change > change: D14LYN > Bells Amount To Give; 35 > message optional?: Thanks for the villager!
Btw those are just examples
If you still dont understand ask me more questions.