A little more data please.

Is there any chance the rim is bent? A slight wobble is normal. A HUGE distortion could be bad.

It is easy enough to replace a broken spoke, provided you have a replacement (or there is a cable emergency spoke that some people use).

Is the broken spoke on the front or rear wheel? On the rear, cassette/freewheel side, or the other side?

You may find it easiest to just remove the cassette/freewheel, but the left side might be able to be repaired without removing the cassette.

You will need to true the wheel after replacing the spoke.

Multiple broken spokes on the same rim may indicate that you should replace all the spokes (which can cost more than a new wheel in some cases). A few isolated broken spokes may be normal.