I want to drill a hole in my ceiling (it is not my place) how can I find the ceiling beams without looking at the original blueprints
You have a stud in the beam (steel or wood), so you should use a “stud finder” they do not cost much, and here are a few.
Most beams or studs are placed every 16" to 24". Start measuring from a corner at these measurements. Lightly tap the area for a solid backing. That is where your ceiling beam will be.
More information on house plans
For a low tech variation of the answer above, just use a small finish nail to probe the ceiling. You should be able to get close by tapping the wall and notice where it sounds more solid.
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