Well, this is my road to getting TBT:
1: Start off with posting. The more you write, the more you earn. I started to write big paragraphs, and I earned a max of 10 TBT for one post.
2: Once you've gotten enough TBT, start buying stuff off people. Sanrio sets, un-orderables or just normal sets are always a big hit.
3: Keep posting and buying. In the meanwhile, do closet clean outs and give items away. Giving people Wishlist items is a great way to earn TBT. Remember not to steal off people or cheat on people, otherwise that'd give you negative feedback ratings, and people wouldn't buy from you.
4: Once you've bought all the stuff you needed, you can start a shop in Re-Tail, or just sell specific items. Make sure you're selling a variety of items, so that more people would get interested. After that, you can start saving a whole heap of TBT, and soon you could buy exclusive and limited time collectibles from the TBT Shop. The best thing to do with TBT Collectibles is auction them, and trust me, the bids go up wayyy higher than the original price.
Well, those are my plans. Right now, I have a shop and once I get enough TBT, I'll buy limited edition collectibles and auction them to get as much TBT as possible!