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I'm curious to know if I were to buy a wash brush it would improve the way my miniatures turn out. And also does anybody know how to apply washes to smooth surfaces without getting uneven marks on it.

Washes aren't really meant for smooth surfaces. They can be used, if applied thinly enough to avoid any pooling and quickly enough to avoid tide marks/overlapping coats. At that point, though, they're being used as glazes, not washes, and you have to fight the properties of the constituent mediums - might as well buy or mix a dedicated glaze, instead. Seems like most folks just slap the wash on, let the uneven marks appear as they will, then paint over them with the base color. Not necessarily the most elegant or efficient method, but it's simple and it gets the job done.

In any case, a larger brush will aid in broad applications, but it needn't be billed as a wash brush, mop, etc. (as used in watercolor painting).

The key to avoiding the uneven patches is to clean up where it pools and direct it to where it should. Brush needs to be a bit soft as well, a stiff one wouldn't work out too well.

I also recommend using a finer tipped brush to apply washes into the recesses if you're not after glazing the entire surface.

You can avoid a some pooling if you apply the wash towards recesses with long and even strokes.

If there are no recesses or you still see some pooling move those pools until they are better spread like n0t_o said.