I do a little weight work in my home gym but am just starting out. I have never deadlifted and don't own any full size plates - only a 1" bar and a bunch of smaller-diameter plates. Bumpers are not cheap so my thought was to get a pair of plates and augment with my existing weights - then consider buying better equipment later, if I decide deadlift is something I like doing.
I have absolutely no idea what my "starting weight" should be though. For bicep curls and shoulder press I'm still only loading my 1" bar to ~20kg. The idea of buying a pair of bumpers what I could lift starting out - but would I be expecting to lift 20kg, 30, 50...?