If you mean a brick or block cavity wall, use "Rawlbolts". If you mean a plasterboard wall try metal self drill plugs, both available from Screwfix. Go online and you will see all types of fixings. The internet is a wonderful thing, if you put in the time to search for help.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix general d.i.y.