If you want a smooth surface, sand inbetween each coat.
For slight uneven texture, use straight from the pot and retain some of the brush marks.Vary brush pattern for each layer.
For a fine canvas like texture, brush horizantal for one coat then vertical for the next, repeat horizontal then vertical until all layers have been applied.
For more texture, add some texture paste to second or third layer but beware that the texture itself doesn't compeat with the brush work of the finished painting.
Each board will have five coats applied to them with a large household paint brush but it's better to use one with long hair as even just doing a few should any Gesso get into or around the ferrule it will dries quickly and cannot be removed. Therefore it's best to keep the gesso away from the ferrule and wash the brush as soon as you have finished. Allow each coat to dry before adding the next...
