I did and still do macro photography without external lights. I'd suggest buying a tripod and just using natural light because you can save money and it's much easier to use. You may consider buying a longer macro lens if you are using natural light because if you have to get close to the subject you will sometimes end up creating a shadow.
However, if you end up buying an external flash, definately get a remote cord (then you will still want a tripod) because a) shooting with on camera flash looks boring and b) if you have to get close to the subject some external flashes will not be able to get to the right angle and still remain on camera. Also, learn how to use it because there's a lot you can do with an external flash unit.
To answer your last question, both are great lenses but you don't need one of each. I love the 60mm but I would just suggest reading up on them and seeing which seems to meet your needs best. I have a 50mm Sigma macro lens which is amazing (except for the autofocus) and was cheaper than the Nikon alternatives. Normally, I'd say Nikon is the best option but if you have a limited budget other brands may be something to look into.
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