Let others know what you have to offer (Product or Service) as-well-as what you are looking for. Simple as that!!!
I have free ranch chicken eggs to trade for produce that you may have raised
Yay! Free-range chickens. George Gobel had one, too (tune: Turkey in the Straw):
I had a little chicken and she wouldn't lay an egg
so I poured hot water down her left hind leg,
then I poured hot water down her right hind leg,
and now my little chicken lays hard-boiled eggs.
I'll trade website and brochure services for free-range eggs and a place to teach music classes. The only produce we'll have is (we hope) honey this fall, but we know you keep bees also.
Have some fun trading products and services! It is the natural thing to do!