agree totally with what cool guy said...
when i started off, almost 90% of my setup was 2nd hand...
partly due to the fact that i was still a student then, limited budget...
2nd hand items might not last you that long (some do...),
but at least they would give you a "feel" of this hobby,
how is it like, the commitment in your time and $$ that you have to fork out for...
once you get "hooked" on to this hobby,
i believe eventualy, you'll start getting new stuff,
and you'll know which are the equipments best suited for your tank..
what I dread most is to see new reefers spending a bomb on new big tanks,
buying the top end equipments,
not realising what are they seeking for.
eventually, they find that this hobby is not for them,
decom after a few months...
and just my 2cents,
do away with external canister filter...
eventually you'll know why...
i started off with using canister filter as well
all the best!