The chicken or the egg is the classic question in real estate next to "How's the market?"
The answer is you dive into both whole heartedly. You get the home listed at the right price and start looking at homes to buy and write offers on in the meanwhile. then tie the 2 together somehow when opportunity knocks--you find the right home.
Your home needs to be listed so well that it gives confidence to the owners of the home you want to buy. Likely you will negotiate and ratify a contract on a new home and you will include a sale of home contingency meaning the transaction is contingent on your selling your home. The Sellers here will be open to doing that if you give them fair price very near market value and can demonstrate your home is priced right to sell, is staged to sell and is presented exceptionally well online with its virtual tour, etc.
So dive in and pursue both 100% and it will work out.
And learn our market by watching this video update on the "boom" Wilmington just had: