I'd give everything a look before you start the engine and after, leave the engine for a few minutes before you start driving but it should be fine.
drain the fluids and put fresh in, also make sure the battery is charged and then crank it until it starts
If you think BEING PREGNATE IS BAD, then yes.
6 months
do a compression test..possibly serious...knocking for 6month is very hard on an engine This needs to be looked at by a professional and needs to be looked at 6 months ago. You have been driving this car in this condition for 6 months? A knock is normally associated with worn bearings. Keep driving it and it will self destruct.
The lender will eventually repossess the car.
Maybe if you left it plugged in for 6 months without starting the car. Then again, if you let a car sit for 6 months, the battery may croak anyway. So, in short: No.
6 months minimum
yes because you can literally sue for anything
Until they can run fast enough to out run them, at about 6 months of age.
I'm not a mechanic / technician but that sounds like your battery has a dead cell if your battery cable connections are good
About 5 to 6 months