£999,999,999 Money
Put your best player (I don't suppose it has to be your best} on the Transfer Market for L999,999,999. Your player will be snapped up within a few weeks.
Unlimited money
Raise the pay of one of the coaches to £999,999,999 per week. Then, offer him a new contract. The coach will now want a contract for approximately -£14000000 a week. Accept the contract to receive that amount in your account every week.
Free players
Replace the first two digits of the price with zeros when players cost more than £23,000,000.
Extra money
Place your best player on the transfer list for £999,999,999. He will be bought for that price within a few weeks.
Rapidly improving players
Do not buy any coaches, but still select players to train as you usually would if you had coaches. The players will improve the selected statistic by one point each week, and youth players will improve even faster. If players are left training on this statistic when they reach 99, they will keep improving to numbers over 100.