With proper maintenance (ie, oil changes) a timing chain should last the life of the engine. It is not considered part of the normal scheduled maintenance. Even if you wanted to replace the timing chain you would not be able to without the timing chain kit that holds all the various parts in the correct alignment while the chain in being replaced. That will set you back about $500 to $600 us dollars.
Even if you had the kit you would have to pull the motor to replace all the timing chains. The passenger side cam is turned by a chain on the backside of the motor and is only serviceable with the engine removed from the vehicle. It is a really goofy setup!
As far as the serpentine belt there are a couple rules of thumb. If there are more than 3 cracks per inch it should be replaced. If it is making noise it should be replaced. Some newer belts will not show cracks and will need to be measured for wear out with a little plastic tool available form your local parts store. They may even have one for you to use quick.
As far as other scheduled maintenance on your vehicle you can check the owners manual. It will have a list of services at particular intervals. Your local ford dealer or independent repair shop will also be able to help you with what needs to be done.
Hope that helps, if you have any questions let me know! Thank you for using fixya.com
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