I don't remember any profession are restricted to become a unit trust agent. Plus I couldn't see any conflict of interest here too.

Pick a company that you want to be an agent for e.g. Public Mutual, CIMB Wealth Advisors etc.

Then you can approach those company & ask them what's their procedures. I did CIMB one, it's pretty easy, fill up some forms & then attend the exams. If you pass, then you can be an agent already.