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Acer don't seem to put the documentation for their laptops online, so you'll have to check your end for the memory replacement guide and system specifications to answer the first three questions. Well, you could find out what type you need to get by using a program like CPU-Z but it wouldn't tell you any of the other information you'd need to know.
In most cases it is simply a matter of unscrewing a plate on the underside of the laptop to get at the RAM. But in some cases you may need to remove the keyboard, but this tends to be on older laptops in my experience.
If you have a 32bit version of Windows then you can make use of a max of 4Gb RAM. If you have a 64bit version then the Crucial site will tell you the max your laptop can make use of. Generally though 4Gb should be plenty, but maybe as much as 8Gb if you run RAM intensive programs on the laptop.