Here's some comments for your guide.
It's safer to save more T before bidding, but 8T is enough for bidding a middle-priced 5* player.
You can try if you have 20+T, but it is very dangerous to bid with a small amount of tokens or enter bidding wars with Asian managers (especially from Vietnam or Indonesia)(because most of them are T buyers).
It's useful when your connection is fast and stable, but this strategy is extremely dangerous when your network is slow or unstable.
Don't only look at the amount of bidders, but also look at their countries and team quality.Most clubs with a team quality of 5*+ are managed by T buyers.
As I said before, most of the bidders from Asia (especially from Vietnam or Indonesia) are T buyers. If you see them, stop bidding any further or you may lose many T.
Players with an age between 25 and 31 have less managers bidding on them. Also, don't ignore player with an age of 32 or 33. I called them as 1T players and they can play for at least 2 seasons.
I often bid on Nord-Gen players with quality (not value) ending with 2,3,7,8 and always win. They usually become 6*(scout) at the mid-season (Day 8-21).
Don't only look at their goals, but also look at their form. Players with a average form from 8 to 9 is probably a good player.
That's all.