Canon EOS ELAN II E built in flash

Yes.

Yes.

The EOS Elan uses a single 6V lithium 2CR5 battery, which should be available at most department, electronics, and office-supply stores. If all else fails, you can buy it online from here.

If you need a manual, you may download a copy from here.

The EOS 50 is called the Elan II in some parts of the world. You may download the Elan II manual from http://butkus.org/chinon/canon/canon_eos_elan_ii_iie/canon_eos_elan_ii_iie.htm

tryed everyones sugestions for erros 05.3 clicks but non worked until i took the flash cover of by takeing 2 screws out very easy and then loosenedthe screw with the spring until flash moved freely

Hi, all canon EOS digital cameras can take all EF lenses. An EF lens from 1989 will fit a Digital body from 2009.
The newer EF-S lenses will only work with the smaller APS-C size sensors on the cheaper consumer bodies.
Hope this answers your query, please take the time to rate!

According to the manual, if you have the selector set in any of the "creative" modes (P, Av, Tv, M) the built in flash will only work if you press the button to pop up the flash. It also references a "hot shoe cover" which, if inserted into the hot shoe for external flash, will prevent the built in flash from working.

You can download the manual here. (The EOS Elan II is the same as the EOS 50.)