Subaru Legacy night stage lights scratch building tips

I am hoping to scratch build some night stage lights for my Hasegawa 1/24th Subaru Legacy, but as an inexperienced scratch builder, I've no idea where to start. Can any of the excellent model makers/scratch builders on the forum offer any tips as to how to create the shapes and what materials to use to get me started. Or just any tips in general as to how I could create these night stage lamps..?? Many thanks in advance guys...