Rule 12. You are allowed to add your labour. For example, you can buy raw materials for £20 (stake money), and rework them into something which you sell for £40. You will quickly realise the limits of this approach, however, and this is a powerful teaching lesson. You can't get rich by working in a conventional manner.
Rule 12. Detail. Be aware though, that this strategy will only work up until about step 20, after which you have to work too long and hard to make each successive step happen. Again, this must be something you're not doing already. Ultimately you will have to trade - buy and sell or start a profitable company with the stake money.
Now please re-read rule seven.