Currently 18 years old, i need some ideas on what types of jobs are there available to start off with.

Just Curious:
Is it even advisable to join car sales advisor at such young age?

starbucks. Uniqlo/H&M. They have proper csreer advancements

retails.

F&b outlet or retail stores.

Do you have any skillsets? Like coding? design? UIUX?

grab driver. flexible.

18 y/o with P License where can do eHailing?

Not really though

But i loved cars since when i was a kid, always got update myself for new cars available on the market.
(Followed car groups like Paultan etc.)

yes you can...as long you have passion on what you plan to do and someone willing to recruit you

I just wonder, why not further your study? Though a degree does not necessarily guarantee you a succesful life, it would help you to sustain your careers and financial commitment particularly when you hit 40's.

If you don't like to study, then i would suggest you to pick up vocational jobs such as hairddresser, makeup artist, plumbing, depending on your personality traits.

About the prospect of being a car salesperson. To be frank, you are 18 year old now, we won't know what will happen to this industry in 20 years time. Over in Europe or US, quite a number of branded car manufacturers already accept online ordering, which allows the customers to customize their requirements and accessaories. At the moment, this seems to be remote for Malaysian markets. But, you never know.