A few pointers.
The symbols in the orcad capture libraries contain no footprint information. They are just schematic symbols only.
What you have to do is the following.
Double click on your symbol to bring up the properity sheet for the symbol. Then using the slider in the properity sheet move it until you see the PCB Footprint colum. In this colum you enter the name of the footprint you wish to use.
To make it easy you can open up the layout library manager and look at the footprint names for the particular footprint then you will know what footprint name to put in the properity sheet in capture.
Looking at your design you should also think about enabling the power and ground pins so they are visible on the IC's otherwise they wont have power and ground net connections. To do this left click on the part then right click "Edit Part", click on the pins that have zero length and change the shape to short also click the box make pin visible. When this is done close the symbol editor and choose update all when prompted. This will update your design and pop you back to the schematic.
The help file in capture is pretty good so have a look there too on how to create a schematic and create a board from it.