Relativistic energy is:$$E^2 = (m_0c^2)^2 + (pc)^2,$$ For light, rest mass is obviously $0$, so $E^2 = (pc)^2$ and $E = pc$. You can substitute $E = hf$ here, and that gives you the momentum of light. Using this and some simple maths you should be able to work out the rest.

Relativistic energy is:$$E^2 = (m_0c^2)^2 + (pc)^2,$$ For light, rest mass is obviously $0$, so $E^2 = (pc)^2$ and $E = pc$. You can substitute $E = hf$ here, and that gives you the momentum of light. Combine this with the number of emitted photons per second from a LASER, and Using this and some simple maths you should be able to work out the rest.