locking down add listing pages

1) I wish to restrict access to the add listing page based on a member level. I am aware some people use s2member however i prefer PMpro.
Just like s2member, PMpro has shortcodes and a php if member level function would I simply be able to use the php function on the add listing php template?
(I have read how to put the template into the child theme btw).

2) would it also be possible to lock it down as far as package ids?
http://urban-fix.co.uk/add-listing/?listing_type=gd_food_and_drink&package_id=12

I want to do this using php, where will i find the files? I can construct the if and else if functions… In s2 member i believe it would be possible with URI’s but PMpro doesnt have this…

This should be the same process as using the if s2 member level php functions, so think of it like that!
Thankyou,