how much for van from xinzheng airport to Shaolin temple? and to Zhengzhou bus station

If you prefer to hire a van, you may drop an email to traveltravelchinaguide.com directly. As I know, they offer car rental service with drivers.

Public transport for reference:
Upon landing, you can take airport shuttle bus line 2 to Railway Station first. The ticket fare is CNY 15 per person. Then walk southeast along Fushou Street around 400 yards and arrive at City Central Bus Station. From there, there are lots of long-distance buses to Shaolin Temple; ticket fare is about CNY30 and duration is about 2 hours.

If by taxi, one taxi allows four passengers. So you need two taxies. The cab fare for one is about CNY 90 in the day time to bus station. But I'm afraid regular taxis would not like to go that far to Shaolin.