Speaker and Amplifier question

[4.698gt 10+ year member]

Ok, so I have 1998 Mustang GT that originally had the mach 460 sound system. When I installed a new headunit, I bypassed the factory amps for the door and they have not been working since then because of the bypass. I have a small woofer in the trunk(the amp I am using is bridged, can I still use it on the other speakers?) and I would like to have these two front speakers working again. I bought some Infinity Kappa series speakers off of a friend and installed them. my question is

should I wire them to an amp or the headunit?

Can I use one amp(possibly larger) to power the front speakers and the amplifier and maybe the rear deck speakers(they are currently running off the headunit).

Do I need the tweeters that are in the rear deck and the doors anymore with Infinity Kappa series speakers where the original speakers are/were?

Is there anything else I would need to make this work?

Thanks for the help

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