Are you talking briar or clay churchwarden? They're probably not the best choice for a starter pipe, though they're not really a *bad* choice mind you, just sub-optimal. Clay churchwardens are very fragile, and though briars are more rugged they still have the other liabilities of the style. The length makes them somewhat cumbersome and they need special (x-long) pipe cleaners. Most of them have quite small bowls (generally group 1 or 2 size), so they're somewhat limited in what they smoke well, some tobaccos do better with larger bowls. But they do look neat, and if you really want one then go for it. Stanwell makes some neat looking "Hans Christian Anderson" churchwardens, though I don't have personal experience with them. I've got a Dunhill and an Ashton churchwarden, and a large-bowled (Grp 6/ODA size) Radice with an 8" bamboo stem extension.
Some guys claim that the longer stem makes a churchwarden smoke cooler. This is true with clay churchwardens but isn't really true with briar churchwardens. The "heat" in the smoke really comes from the moisture in the smoke. If you remember your high school physics, the heat in steam comes in three separate phases: the heat to get the water up to the evaporation point (1 Kcal/gram-degC), the heat to vaporize the water (540 Kcal/gram), and the heat to raise the temperature of the steam to whatever it gets to beyond that (0.48 Kcal/gram-degC). When it cools the water dumps whatever heat it contains as it transfers through these three phases. Of these three the heat of vaporization is by far the largest. Six extra inches of lucite may cool the steam down a few degrees but it's still steam and when it hits your mouth and condenses (dumping the heat of vaporization into your mouth) the 1-2 Kcal/gram less energy from the lower steam temperature doesn't really matter compared to the 540 Kcal/gram that the steam dumps in your mouth just because it's steam. Clay churchwardens smoke cooler because the clay is absorbent and those extra inches in the stem allow the pipe to absorb more moisture from the smoke so there's less of it hitting your mouth to begin with (this is also why clay churchwardens get so hot, but better the pipe than your mouth). This is also how those balsa and paper filter pipes and peterson system pipes cool the smoke, by absorbing (filter pipes) or condensing (peterson system) the steam before it gets to your mouth. But briar churchwardens use non-absorbent lucite or vulcanite for the stem. If you can find a bamboo-shanked churchwarden it may smoke cooler, depending on how the bamboo is reinforced (some just reinforce the ends, some use a steel or brass liner, some are filled with some sort of plastic and then the air hole drilled through it).