2002 Toyota Corolla oil problem

So my car has been burning oil now I can smell it
when it gets low ... As wierd as that sounds .. and
I've been write every time .. now I was told because
at first it blew out smoke every now n than that the
gas and oil aren't getting burnt off write and
instead going through tail pipe n eventually
clogged it .. also I ever now and again have to take
spark plugs out clean them and put them back in
the engine .   Now reason for spark plugs is
because whatever the problem with car is it losses
power and white corrosion all over spark plugs so
it losses contact ... My question is what would it be
wrong with it n is it worth fixing ?