Advise on emulsioning after wallpaper removal

I plan to emulsion my living room walls having removed wallpaper that has been on for the past 15 years. The paper came off not too bad. I plan to use sugar soap and a good bit of sanding but.... can anyone recommend what to use as a first coat of paint on the bare walls? Ive heard there is a polyfilla paint that fills minor holes and cracks, its that any good? TIA
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