You are aware that to register your company under the Travel Agent License, you will need a paid-up capital of at least S$100,000? It's very high cost, and super competitive.
If you really like travel, suggest you go for specialised travel e.g. golf travel, adventure travel, spa travel, eco-travel etc. We have noticed that nowadays people are so bored with normal travelling, they embrace any new-age forms of travelling whole heartedly