Where do you start when looking build a team for a real project?
In freelancer site's like upwork,fiverr or any other more but just make sure that the project placed is good and true with informative introduction so that a people finding a good team will find a great guys who can contribute well for the persons who searching for it. Anyways be more cautious upon finding a team and a reasonable budget will be must on that findings so that you can choose more good contributors on your or anyone's project.
Freelance sites is the most common place on searching up team members with do have the specific skills that you are looking for. Selecting the best candidate would always vary on your decision and be sure they do really have the capability on doing their own field and utilize their skills and be more productive on the project would be made.
You need to trust your team. This is the main reason i think.
Trust is needed on any field when it comes to team handling or creation but it wont really be enough yet skills and expertise would always be the main concern.