1. You can look in your transferhistory, which is accessible from your teampage.
You also should be able to see this in your economy page, however it is not clearly separated, it is under weekly income, so if you had no other weekly income, it is fairly easy to spot, if you had weekly expenses and/or income, it is not so easy to see.
2. TV money is not so low. I'm not sure how much it is for Div IV but I know it's 275k for Div II and even 400k for Div I. There are 3 TV games each season, so it is extra money for free!!

The problem you are facing, I think, is that you can't buy a
good player for that money, but in Div IV you normally wouldn't need that good players, so it's best to buy a player a little less good, and try to train him into a good player yourself. Most expenses a Div IV team has, if they do not purchase or hire anything they do not realy need in their division, can be covered by the TV money easely.
As with the affinity for your players: you buy just a few young players who aren't that good at this time, and use the ones you got, fire the worthless players, and maybe sell a few mediocre or almost good players you have, but will not use as starters.
You now can start training your players, and they will grow into good players fairly quick. Players you would not be able to buy because of their prices, you can still get them this way , but you will have to be patient...
3. if you train C, then every player who played at the center spot that week receives training (no matter what their best position is advising). Ideally you want your centers to play 48 minutes, because if they get more, those minutes are lost, since they do only get training for 48 minutes. But beware! less than 48 minutes reduces the effect of the training, and I've been told this is significantly, so I'd say if you have 3 players for C, 55 minutes + 52 minutes + 37 minutes is far better than: 46 minutes + 45 minutes + 53 minutes, since in this last case only 1 center got full training, and the 2 other significantly less. There is no hard evidence on this however so you should not take this as absolute thruth!
4. in the (very) long run this will be bad since your players won't develop in offense and as you progress your team trough the divisions you will not be able to score anymore. Also if you want to sell an all-round player will fetch you far more than a 1 sided player.
You can ofcourse opt to only train defense, and sell your players in time to make money and buy the players you need with that money, so in this way it is not bad.

5. not that I know off.
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