Selective content apearance to registered and pay users

[ektwr]

Dear Friends

I would like to make a selective site like the possible one mentioned in link below

http://www.telemastoras.gr/images/telepayed.jpg

I 've already made the section called projects, all menu categories and put some sample contents there.
I would like to show in mainmenu all the project lists to anyone.

When you choose the appropriate selection e.x. TV--> to show all the contents in this category in thubnails.
Then if you are registered you must be able to choose all the "free flaged" thubnails when you click to them.

But if you are registered and payed user you must be able to choose all contents of all categories with no limits
for a 35 days period registration. After that period the system must send a notification email to not payed users. 

Please help me or suggest any articles in forum refer to this.

I will appreciate any help for newbies like me!

ΕΚΤΩΡ
http://www.telemastoras.gr

"Ούλε τε και μάλα χαίρε, θεοί δε τοι όλβια δοίεν!!"

    (Να είσαι καλά και να χαίρεσαι,  οι δε θεοί να σου δίδουν   

       ευτυχία) - 'Οδύσσεια', ω 402