With money anything can be done, but it may cost more than the vehicle is worth to make the change over.
the stickshift in the car, either on the steering wheel or on the floor
You start the engine in neutral.
The clutch pedal.
no because if the car is dead it will not run up
A car with an automatic transmission.
4 cylinder means how many cylinders (like cans kind of) in which gas is sprayed and air combines and then is ignited to make power. The more cylinders the more combustion and in theory more power, all things equal. It typically means more gas consumption too. Secondly, automatic relates to the transmission. That means you do not need to shift gears, because the car does it for you. As opposed to a manual transmission, otherwise known as "stickshift" where you have to shift gears yourself.
fuel filter
Yes, by removing the manual transmission and installing an automatic. Unless you have a donor car this would be extremely expensive. My advice is that if you want an A/T sell the car you have and then buy one with an automatic.
no
It's possible, but far from being a feasible thing to do.
this depends on whether the car is standard or automatic. If it's standard , then the clutch is not realising all the way and needs to be serviced. if automatic then worn gears or out of adjustments on linkage are possible
yes you can all you need to do is switch the automatic flywheel and putt on a standard flywheel and make sure the clutch from the transmission will bolt up to the flywheel.