best wallpaper is vinyl but looks like Paper!
and it is pre glued
and then you still use glue for no bubbles
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you'll have to scrub it hard with that wall cleaner that's strong,
real strong... called TSP but word of warning it can burn your skin so use as directed
then use some dura-bond 90 for quicker drying mud
it sets up in 90 minutes just like wood so you can scrape it
just before (say @ 55 minutes)
it drys to get within a 16th or 32nd of flat then use regular
joint compound that's much creamier after spraying it with a mist
sprayer on your hawk
to finish off any low spots...
then prime , then paint
.... or buy the expensive paint that has primer built into it