Based on your level and achievements in the game, you will have free clothing options. Do not spend coins on clothes unless you have lots of spare money.
Tap as much as and as fast as possible using multiple fingers.
The Library allows you to spend money to train your workers or play Pong. Pong is extremely difficult and usually will end up costing money. Training also is not a good choice, because you have to pay for your workers to get experience. Save your money and do not spend it at the Library.
Purchasing the Motel requires 65,000 coins. Start saving for it after getting three workers in your business and maximizing your Coin Upgrade multipliers menu. The Motel is the first house that you acquire and it opens more options.