Is pfSense support this wireless NIC Realtek RTL8185L and how to? i installed pfsense but that said wireless nic is not detected.
pfSense is built on FreeBSD which providse the device drivers. The FreeBSD supported hardware list at http://www.freebsd.org/releases/7.1R/hardware.html doesn't list the Realtek 8185L as a supported device. You will probably need to get another device, preferably one thats on the FreeBSD supported device list.
If you want to use the pfSense box as a wireless access point you will need to choose a device with access mode support (not all supported wireless devices support operating in access mode).