I purchased a Bosch GRL HV kit last year for similar project(s).
It works great. Lowes had it on sale and I purchased a $50 off coupon on eBay for $1., which they honored. Compared to mucking around with a line laser, tapes, strings or a level it is pretty good!
Unless it is dusk, night, or against a solid background in shade you will not be able to see the beam and will rely on audio beep and visual led's on receiver, which works very well. There are green lasers that supposedly show up better in brighter situations, but cost is quite a bit more. Also, the further away you are from laser the less visibility the laser beam, however the audio beep is what you are working with in most cases. Red laser glasses are one way to enhance visibility of beam.