The document size is 286x210 and the bleed is 3mm on all four sides. Turn off facing pages.
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Set your margins to 16mm all around (or put guides in those postions if you want wider margins). Not sure what this page is for, but they are telling you, badly, that the types hould not extend beyond these points.
Trim Size = width and height in the New Document dialog box.
286 x 210
The bleed is an extension of the page where anything that needs to be printed to the edge of a page needs to go into bleed area to allow safe trimming.
This is 292 x 216
216-210 = 6
This is on both left and right and top and bottom - divide the results by 2
So your bleed should 3 mm on all sides.
Type area is the margins, this is where all the material that doesn't need to extend to the edge of the page needs to go. Anything outside this area may look bad when the final pages are trimmed.
Your Trim Area is 286 x 210 and the required type area is 254 x 178
That would mean you set your margins to
(286 - 254)/2 = 16 mm top and bottom
(210 - 178)/2= 16mm left and right.
But this depends on if this is a book? If it's a book it's not a good idea to have even margins - as it will look lobsided when printed and bound.
I'd talk to your printers about what Margins would be optimal for the layout - if you're not sure yourself.
Keep the margins even. You have no way of knowing if they'll put the ad on a left or right page. And keep any important image details inside the type area, too, or you'll risk losing them in the binding.
Yeh you should be good to go.
Anything that needs to go to the edge of the page needs to extend to the bleed line (red line)
Anything like text or anything that is not going to the edge of the page sits in the margins, 16mm away from the edge of the page.
You can put objects outside the margins, but you want to stop anything that doesn't bleed far enough away from the page edge so it looks deliberate rather than like something that was supposed to bleed, but doesn't.