Once you have successfully taken over a company, you are responsible for making all its finance decisions. You will need to carefully monitor its financial health and decide when to withdraw dividends. You may sell your shareholding back to the sharemarket at large (this takes one year during which you may not meddle in its affairs).
Controlling the Owned Company's Finances
You are responsible for all the company's finance decisions. To do this effectively you will need to discuss their plans with them and agree on what finance they require. To make this a successful investment you will need to ensure that you are receiving (or will in the future) an appropriate return on your investment either in the form of dividends or as increasing value of their shares.
Selling Your Shareholding
You may sell your entire shareholding back to the sharemarket at large. This process takes a year, during which you may not meddle in the company's affairs. You will receive the share price at the end of that year. To keep things simple, any loans you have made to the company will be written off as bad debts.