The main challenge I've observed is that individuals often lack a clear end goal or strategy or they select a market that doesn't align with it.Setting a well-defined strategy and ensuring your chosen market complements it can significantly enhance your investment journey.

So as far as the percentage to compensate them - that really depends on who is doing what and for how long. 20% of a deal that will only get $10k of profit at the end isn’t very attractive - but that’s the gamble you take with equity.

If anyone has experience with this, I would love to connect to learn more about it, the contractor you used and the materials chosen. 

Because of their manipulative behaviors, I have chosen to limit most contact via e-mail, text or mail.

will you travel to your chosen market?

I agree with the other comments that you should learn as much as you can about your chosen business. 

For the most part, people who have chosen a remote or traveling type job do so because they like experiencing other cities.

I have chosen my niche which will be students flats.At the time I am studying construction civil engineering and I want to buy my first house next year (3 years left of school) in the big well known city among tourists and students in one of the european country.

Absolutely make use of all the online tools available throughout the processEvaluate resumes and reviews/recommendations from trusted resouces, peers and past clients (like you would on LinkedIn for example)Narrow down your search to the top candidates and schedule in-person interviewsChoose your top 3-4 final candidates and check referencesThen ask at least three to provide bids for your scope of work requiredEvaluate the bids and pick your top candidate...then there is one crucial step left...Make sure to take an in person look at the physical finished work your final chosen contractor has done recently.Like almost everything else in real estate, choosing a great contractor requires time and effort.  

This is Called GAMBLING.