Congrats on the licence.
Is the aircon on your unit, will that be your entrance point ?
Looking at the pics you posted you have plenty of options.
Start looking for wire .,insulated house hold electrical wire can work well or household earth wire. Enameled copper wire becomes almost invisible after it has been up a while . Big gauge copper can be expensive You can purchase new or salvage it from old transformers remember if going stealth the wire only has to be strong enough to support its own weight . I have built successful antennas out of 22# wire that could handle a couple of hundred watts ( or course 10# would be better )
The trees are your friends . Good tie off point and will help hide your antenna, if the trees not high enough you can put a pole up in the tree and it is still mostly hidden.
Dont worry about orientation 40m or 80m antenna will most likely be to low to show any sort of directivity
That pole would make a great mount for a vertical or a second tie off point.
Unless you have a understanding landlord and neighbors A multiband beam is out of the question.
So I would go with either an end fed with as much wire as you can go into the highest point of that tree.( and why I say end fed is that the hardware ,balun coax etc is at one end and is easier to hide.) or a vertical on that pole . You can get telescopic fishing poles at lengths up to 43ft long and that would work well off that pole..
have a look at Moleculo's
Homebrew 9:1 Unun for random length wire antennas
