The PS3 will not be able to play the PS4. They both are on the Playstation Network (PSN) and Playstation Plus will work for both of them as it does for the PS Vita and PS3
A person will not be able to hack the PS4 and then be able to play online for free. The games will need to be purchased as will the PlaystationPlus, which allows people to play online.
connect your ps4 to your pc or monitor
You don't have to pay for online gaming, unlike the PS4 - you don't need PS+ to be able to play it online.
It costs $49.99 in a year to play Sony's PS4 online.
no
You can connect a wi-fi adapter to a ps4 using Linksys PS4 Wireless-AC universal media connector.
Yes, one must have a PlayStation card to play the PS4 online.
No they have a different plug in to charge therefor the ps3 controller won't connect to the ps4
Yes of course
You can go to the PlayStation store and download the PS4 version on your PS4
You can buy a PS4 at any good games retailer both in stores and online
Use an adapter which would connect to the monitor and PS4. Old monitors usually have a VGA port. Look for a HDMI to VGA cable