router access control list

Hi,
 Im a rookie. And i worked on access-list 2 years ago once nad never have 
again. Now i need to do it for my new job. 

cisco 800 series. (827)

I need to block alot of traffic. specially using remote access. I need to block 
all ports execpt 3390, 3389, and another one that i cant remember. thouse are 
remote access open ports for different computers. Also block all other ports 
that except the common ones. (ftp, email, internet, etc...)

Now in ip addresses: the router has change the ip address for the people out 
side dont know the real address. i need to block everyone else. 

how can i do this in an access list. some examples or something will help 
greatlly. 

thanks 

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