I would say most LFS in Singapore are able to assist you for a simple set up. Just visit any LFS near you. Most are decent in their own way! You don't have to buy anything, just talk to them. If you want to fact check, feel free to ask away in the forums.
There is only really 1 shop I would avoid, especially if you are a beginner. It's located in the west. So if you live in the west, think it's not fair to name in a public forum, so just PM me to confirm or deny that is the shop I'm referring to.
But as mhcraft has mentioned, it would really help to know more details for us or the LFS to assist you better.
The most basic questions would be: What size of tank do you think you want? what do you roughly want to keep (fish only, soft coral, sps)? Have you maintained a marine tank before? freshwater?