Make a door-and-key list
Put each keyed entrance on a separate line: front, side, rear and any other door you are responsible for. Match the supplied keys to the doors they already operate. Label a spare only when you know what it opens. Include a shared building entrance on the list, but mark who manages it; responsibility may differ from your private door.
Note any stiff movement, loose handle or latch that does not catch. You do not need to keep testing a struggling lock. A fault you have already observed is useful information for a repair conversation.
Choose the question before the hardware
If the lock works well but too many keys are unaccounted for, ask about rekeying. This changes the operating key inside suitable existing locks. If a door does not close or lock properly, explain the mechanical issue separately. Changing the key alone does not solve every door problem.
Wanting one key for several doors is another question. It depends on the actual hardware, not just the way the handles look. Explain that goal before buying parts. Keeping a handle you like may be possible, but condition and compatibility need checking.
Plan the people as well as the doors
Decide who should have a key: household members and anyone authorized to help at home. Keep that number beside your door list. If you rent, check the agreement and speak with the property manager before arranging changes. Shared entrances deserve particular care because other occupants may rely on them.
When you discuss residential locksmith help, ask which cylinders are included, how many keys are supplied and how the result will be checked. A door outside the agreed work can still accept its old key. That last review keeps a tidy new keyring from hiding an overlooked entrance.