Hi all, first post!

I am new to the IT business but I had RF wireless network (licensed) and microwave backhaul design experience. In the latest years I worked as RF hardware design engineer for wireless base station applications. Now I decided to get myself educated in the IT area. Initially, I thought I should extend my skills to Wireless LAN which is closer to my previous expertise. I figured I need to study for the CCNA Wireless IUWNE exam. Then someone told me I have to get CCNA passed first then take the CCNA wireless certification.
My questions are:
1) With my background which level should I start with? CCNA or CCNP?
2) There are many certificates, If I just want to be a professonal on Wireless LAN should CCNA wireless or CCNP wireless enough?
Would someone explain the process for me?
Please excuse my simple questions
Thank you!!!