Not to discourage you, but you need to be prepared to catch the largest fish in the area and a 4wt won't cut it.
A light trout rod will cast the small flies, but to be fair to the fish you need to use a rod hefty enough to land any fish you catch in a timely manner.
An 8wt will do and there's plenty that size that are reasonably priced. One of mine that I use regularly was $25
An besides, once you catch your first fish that's large enough to eat pasty little trout for breakfast, you'll have salt in your veins and may never fish for them again
(just kidding folks..... well half kidding