Look man, there is nothing to be scared about, Singapore is a great country, well for people who are tourists because if you live there permanently, its hard. I been living in Singapore for the past 4 years.
The bad thing that the things here in Singapore are quite expensive and the weather is not pleasant, its very hot. 30-35 degrees Celsius and its very humid which makes it even worse. The temperature is like that basically every single day, there is no winter. Only summer because it lies closely to the equator. But other that, its good, its a great place for tourists, its a very safe country, transport system is great, its perfectly safe to take buses(I take bus to school everyday). The good things is that Singapore is a very advanced country, so there is basically AC every place including the buses, you will see buildings everywhere, and its also very clean, it has a pleasant environment.
There a lot of malls there, most common are the Parkway Parade, Suntec City, Tampines Mall, etc... There a lot of places to shop, buy high quality clothes, any other stuff. The people there are Indians, Chinese and Malays, majority are Chinese. just in case you haven't found a hotel, you can go Marina Bay Sands hotel,(its very expensive though) or the Orchard Hotel.
The best place to visit would Resort World Sentosa, there is a Casino there if you are interested and also a big place called Universal studios where there are so many things to do, there are many trilling, exhilarating rollecoaster rides, I went there 4 times and I have enjoyed it thoroughly. You can also get to see some Music/dance performances there, there is the 4D short Shrek Movie, and many other things. If you like to see animals, you can go to the Singapore Zoo. There are many enjoyable things to do Singapore. I hope you have fun there.
One more thing, it may be a little bit hard to understand how Singaporeans speak because their accent is weird and they speak "Singlish"(english combined with little malay and chinese words). Words like lah, walao, sia, lepak, lor, bodoh etc.. are very commonly used there, I always try not to use those words but most of the time, I just can't help it. An example of a sentence that Singaporeans speak, instead of saying "why are you being like that?" they say "why you so like dat sia?"
Well anyway, I hope you enjoy your trip in Singapore. Wish you good luck