First of all:It sounds like I have been offered a similar job to Ady86. I was asked to start working on a visit visa and will be paid solely by commission which is 50-50 at 2% of each property.
Is it possible to get by financially on this and if so how long would you advise to account for before I have substantial income?
It is illegal to work here on a visit visa.
Can an expat work in UAE on a tourist visa? | The National
Employing Illegal Workers: The Implications And Pitfalls - Al Tamimi & Company
You need to do some proper research. There is plenty of information online.
Do a search on this forum and you'll get an idea.
Here are some more articles to read and have a good think about it.
Former employee left homeless after S&K collapse in Dubai | The National
Dubai still has too many real estate agents, says RERA CEO - Property - ArabianBusiness.com