You NEED a mentor who will give you hands on experience over a number of weeks.
On the allotment site where our bees are kept, several of the members have expressed an interest in bee-keeping. I have suited them up taken them to the hive, one got within 3 feet of the hive and ran off, one lasted 5 minutes before giving up. Worst seems to be about the 4th or 5th time they have to inspect the hive, one full on panic attack and 2 up chucked in beek suit. I have a couple of regular helpers but they are now just happy to help.
I am not being negative but you need to know you can work with bees before you waste vast amounts of cash.
Silly question but do you have access to your back garden other than through your house? If no, then it is a total non starter.
A single hive is also a non starter.
2 hives worth of fully loaded bees returning on mass in the middle of summer is a sight and also a sound to behold in a small area, add bar-b-q smoke from a neighbours garden...........
Good luck anyway
Angus