Start writing novels on your computer. Write fiction novels as they take the least amount of time. They will not bring you too much Simoleons. When you write, your skill will automatically advance. If your skill is high enough, you will be able to write more novel types/genres. The most money can be made from "Romance Novels". You will get royalties for six weeks once you finish a book. With the "Writing" skill maxed out, you can make approximately 40,000 Simoleons every week, which is more than the 34,800 Simoleons you can get by purchasing all neighborhood businesses, and takes less time to achieve. In three game weeks you should have a very high speed writing, 9 or 10 novels as best sellers, and 100,000 Simoleons.

Buy a guitar. Play it to learn how to play guitar. Keep playing until you reach 5/10 level, which gives you the ability to "Play For Tips". When you have that ability, go to the park with the guitar in your inventory. When you are in the park, click the guitar in your inventory, and select "Play For Tips". People watching you will become your friends if you keep playing. The higher your guitar skill, the faster they will become friends with you.

Instead of using a cheat code to toggle "aging on" and "aging off" like in The Sims 2, you can de-activate the age in "Game Options" under "Options".

To get new clothes, you first have to buy a dresser from "Buy Options". Once there, click "Plan Outfit". You can put a total of three different clothes for each type (formal, every day, athletic, etc.).