I did some rollerblading back when I was a teenager; just basic skating, and I haven't done it since.
Just a note of advice; just as if you get your blades sharpened, oiling (or getting water) into the bearings can make a real difference to the 'quickness' of the wheels.
If you're a decent level on ice it will take you just a few sessions to get used to wheels, main thing is slopes and bumps so you need space (or confidence slowing down, changing direction) and soft knees.
Harder wheels are more durable, but they will wear out, and unless you skate very evenly you may need to rotate the wear between inside and outside edges, also front and back wheels tend to get more wear.
Water combined with road grit/dirt is the worst. I tend not to skate in the rain unless I have a very grippy surface as if you're doing deep edges you will lose your skates from under you.
Before and after every session I check the axles on the wheels to make sure they have not come loose - I have lost a wheel before while skating so worth it especially if you have been cleaning them or rotating wheels.
Minimum safety equipment I use is wrist guards. Helmet helps for confidence when going backwards, to make you lean.