since I ve done all of this completely offline how will the blockchain know about my address and private key?
The network will never know your private key - that's the whole point of doing it all offline. In terms of your address - every address already exists. I can send coins to any valid address at any time, regardless of whether or not someone has already generated it in their wallet.
Now I am afraid to send the money to that address because I don't know if it should've been done while I was still online or the way I did it was the right way to do it.
Doing it online would completely negate the whole point of an airgapped wallet. What you have done so far is correct.
Would be a better idea to transfer the files through bluetooth , sd card or anything else ?
This is what I would do. Format device, keep it airgapped in airplane mode, transfer app on via an SD card.
What can it be done to be secured 100% against these methods in the case you take the malware .
Preventing physical access to your house would be enough to protect against most of them, but such methods of attack are incredibly rare and incredibly difficult. You would have to be a very specific target of some very technical criminals to have to be concerned about these attack vectors.
In this case 2 phones using qr codes would make it safer than an airgapped pc?
There are too many variables to definitively say one is better than the other. I like an airgapped computer running a clean install of Linux and using full disk encryption, but two phones using QR codes is still a good set up.
if I use the phone as an Airgapped device should I try to destroy bluetooth/wifi/antennas hardware (if there is any way) or is it safe to leave it as it is?
If you can physically remove the relevant hardware than that is better than simply disabling it. That is part of the reason I prefer using a computer, as it is far easier to remove the hardware than on a phone. You might find the connectivity hardware to be embedded in to various boards and near impossible to remove or destroy without affecting the phone's normal functioning.