Go4Expert - please help me ( double linked list )

plz i wont soulotion of my questions by codes :

where list is the node pointer for the whole double linked list
how i can :

1- add a node after the node that has 30

2- delete a node at the beginning of the list

3- delete a node before 30

4- count how many nodes are in the list

5- count how many nodes are greater than 10

6- count how many even and odd nodes in the list !!

7- print all the nodes in the list but ( backwards )

8- split the double list into 2 , where the first list has a pointer list and the other one has the pointer head , and it starts with the node 15 !!

make answer what you know plz :(