There is no need for you to use anything else than sRGB as long you cannot come up with a clear justification
- when you reach that point you'll know why you need AdobeRGB and what to do with it.
Prints can be quite ok ... keep in mind that the labs also do their standard adjustment, assuming that your images come straight from the cam of an average casual snapper. So they will do adjustments (Auto WB, exposure, sharpening etc.) That will make your previous adjustments a bit useless. Solution: tell them not to adjust anything. If they look puzzled change the lab. Search the forum for 'prints' and you'll find information and recommendations about labs.
ACR? That's Adobe Camera RAW. You mean you have RAW files, edit them and then use "save" function? I don't know Adobe Bridge but Lightroom has a settings where you can select what to do: a) give new name; b) ask what to do; c) overwrite. You don't save any changes to a RAW file.
In case you work with JPG from the came I guess it's common sense that the program will not change your original file. Keep originals, always.