Hi, welcome to the forum.

I will try to answer your questions, but please check out my videos, specifically the one on Auction Strategies.

You have to bid every round or it goes to the last bidder.
Time Hawks don't always win, there is a counter strategy to this.

You should never place more than 1 token in a round for any reason.

I don't have a billion tokens, I farm a lot and have over 1,000, but I have been accumulating them for 12 seasons. I usually get the players I want, but not always. It's very random, sometimes I'll get a super expensive player for nothing, sometimes I can bid all day and never get him. Learn how to recognize the owners you don't want to go against in auctions.

Again, see my video and all your questions on Auctions should be answered.