New sink and faucet but no water?
There is often debris from manufacturing, sometimes dislodged during shipping.

The first thing to try is to unscrew the aerator and clean it. If it still has problems with the aerator but works fine without it then the problem is the aerator.

If it doesn't work well even without the aerator installed then something is wrong in the cartridge or other innards of the faucet. Faucets typically come with a parts diagram for replacement parts, but if it comes to taking it all apart then I would just take it back to the store, particularly if you got it from one of the big box stores that has easy returns/replacements.

But my bet is the aerator.