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

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.