As Brendon says unless you are going to change the type of lawn then just fix the old.

It is far cheaper to bring back the old if you just want the same type.

If you are going to change the type of turf ensure you spray the old 2-3 times over a 4-6 week period with roundup(glyphosate). If you don't do this the old will grow through the new.

Budget for minimum $3/roll for couch (winter/Windsor green any thing like this)
$10/roll soft leaf buffalo ( sir Walter or velvet)

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Its all about the pink flaps