Sorry, hate to be the killjoy, in my view, the OP is wasting his time because:
1) seems to be fresh grad level with no experience, obtaining working visa very very difficult;
2) has to learn local real estate law and get license;
3) does not know any landlords, and maybe no language skill to communicate with same;
4) doesn't know that HK real estate is really really local, would not be HK agent, would be local agent completing with hundreds of agents;
5) starting at bottom means endless days of cold calling;
6) if asked about property matters, e.g village house, ding rights, Illegal structures, gov. land, Short-term tenancy, building management, ghost house, does not know and it takes time to learn;
7) without Cantonese difficult to get past security guards to show property, ask about the management fee, clubhouse facilities, etc.
as @Elegiaque says OP needs a lot of cash to cover learning time.
my 2 cents