If you have added vehicles to your Ymap and they are not showing up, try changing the flag to this: 1879051873 <------This flag should usually (but not always) force the vehicle to appear at the location you have chosen. For the peds, I don't know of a way to do that with Ymap, but you can place peds using scenarios in CodeWalker. Look up ped scenario creation and CodeWalker or check the Codewalker discord and there is lots of info for placing peds.
