you might not want to use water color paper for your "negative"
it is too thick and will be a PITA to get light and uv rays to pass through.
if you are planning the cyanotype route for your negative, use the thinnest
paper you can find ... non watermarked stationary, xerox paper of some sort.
you will probably have trouble because it is recycled paper is is buffered
but there are ways to resolve that at least for the short term ...
its easy to wax ( the flickr vid i posted for you over on the lf forum )
with just a hot plate and a little wax ...

you can probably use sunlight, after all talbot was from england and he just used sunlight
to make both calotypes and salt prints .. facial tanning lamps are pretty cheap ..
just get some welding goggles

have fun !