Yeah dont skimp on anything especially filtration ( which includes UV ).
Planning is key; some points to consider are the edges, bottom, and flow.
Do you want a "zero edge" type where the edges slope into the pond like a beach ( much more natural looking and attractive ) or a vertical drop into the water like a pool ( helps keep fish safe from predators )? Do you want to cover the bottom in gravel, a few large rocks, or leave it exposed? Gravel may trap debris and foul the water thus requiring more maintenance. Rocks provide shelter and shade for the fish and add a nice touch. When considering flow consider wind. Which way dose the wind generally blow? You will want to place the skimmer at the most down wind point as possible. The skimmer will suck surface scum and leaves into it, if that flow is opposed by the wind the efficiency will be reduced. Dead spots are another common problem, my advice; avoid them. This may require the use of some smaller supplementary pumps.