There's no simple or single answer to this question. Too many variables to even begin to help you
Simple it isn't, and please don't take this as discouragement; if you're really willing to put in the time, effort and money, sponsoring and maintaining a repeater is a great way to hone your technical skills.
Another thing to consider is how many repeaters are in your area? Is another one really necessary? In my area, there are some hams always complaining about the number of repeaters that are not used. They are at various times but not all the time. I do not believe in "private" repeaters but some are. Thus the need to coordinate frequencies to ensure not interfering with another.
A typical duplex repeater can vary in price.
Need a transmitter, receiver, controller and antenna system in the most basic forms.
Avoid LMR cables. In a full duplex environment they degrade and lead to passive intermodulation issues (usually comes up as noise in the transmission).
Filters can get expensive in order to provide proper isolation.
The real question is what are your goals for setting up a repeater?
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Welcome to the club. A lot of us just have that need to build something.I dont know my goals. I just have a need to build something...