1. 1-3 first days of season i search market in early morning hours till i complete my squad. I buy only 18-19yo nordgens, fast trainers. Depending on my resources of greens, I power train them assigning positions, sa and increasing quality till 7stars or near that. (About how to find nordgens and power train go to tutorials section and read the guides)
As it is early morning hours, there are no bidding most times, so I spend few tokens.
2. Every two-three seasons , if there is a gap in my front line and there is a good negotiation offer (aka 19yo, 2 positions am/st) i buy the 79token player. But I do this only if step 1 has not covered my squad.
3. I buy some good low star young players, that have potential value growth, in order to make my training bonus easier and next season i sell them through negotiations, most often covering the expenses of step 1.
If you have a good association token income, plus the daily token sponsor gift, you will never need to spend money in order to be competitive