You have a blank canvas there mate.
You can do...
No tie with no pocket square.
No tie with a pocket square.
A tie with no pocket square.
A tie with a pocket square.
I can't think of a tie or pocket square that wouldn't go with that combination. Experimentation is fun.
And try here for some inspiration Today's Tie
(Personally, I wouldn't wear a waistcoat with no tie, it doesn't look right.)