Let's review. Solomon was supposed to build a temple for God to dwell in; a place where He could stay among them. And, he was on board with that. But, he recognized that despite all the supplies his father had collected, he needed some additional resources to be able to undertake the mammoth project. So, he contacted the king of Tyre and inquired about the possibility of getting some help. He especially requested that the king of Tyre send an expert craftsman/engraver... and lots of lumber.
Now, just like David wouldn't offer God something that didn't cost him anything (1st Chronicles 21:24), neither would Solomon take Hiram's goods for nothing. He offered grain, wine and oil in exchange for Hiram's help. And, Hiram agreed to give Israel's young king what he asked for. So, Solomon arranged his tens of thousands of workers in order. He was ready to get started.