Acer1608,
As for the equipment you have - forget the PIX 515, CCNA does not cover the PIX in any way so it will only confuse you, Use the 2500 as a Frame Relay switch and connect (if it only has 2 serial) the 2801 and 2600 through the 2500 FR Switch, you will need WIC 1Ts for the 2801 and 2600 as well as DCE/DTE cables. The DCE end goes to the FR Switch.
If you are lucky enough to have a 2500 that is a 2520/21 or 2522/23 you will have plenty of serial ports to attach the 3 routers, if not just get another 2 WIC 1Ts and connect the 2801 to the 2nd 2600, that way you can route to a 3rd router accross the Frame Relay switch.
You will also need at least 2 2950 switches, you can get them on eBay, don't expect work to supply EVERYTHING !!!
Read the info at Networkworld on setting up a home CCNA lab - the link is below.
As for study, I would get 2 books, Sybex CCNA Study Guide by Todd Lammel and one of the Cisco Press CCNA books, Wendell Odom is one of the better.
Between the 2 books the Lammel book will give you what you need to know for the exam and the Cisco Press books tend to go into more detail so you understand it a little more and can work with it.
It also helps to have 2 different perspectives.
The CCNA is a lot about troubleshooting - a sim like Cisco's Packet Tracer is good, an emulator like GNS3 is better and a home lab of real equipment (3 routers and 2 switches) that you can do end to end networking is the best, a place where you can try all the different commands and labs!! Using all 3 to get hands on PRACTICE,PRACTICE and MORE PRACTICE is the BEST !!!!!
HANDS ON PRACTICE, as you read about it get in the lab and try it. Here is a link to Wendell Odom's blog at Networkworld about setting up a home CCNA lab -
Study the material, take practice tests and use those to determine where you are and go back to the areas that you don't do well in. DO NOT JUST LEARN THE PRACTICE TESTS !!!! Use them to understand where you are at in your study!!
As far as how long it should take depends on how much time you have to put towards study, it could take a few weeks or almost a year, when you know the stuff in the books and on Cisco's CCNA exam blueprint like the back of your hand - take the exam !!!
Good luck and I hope this helps !!
E.A. Broda
CCNA, CCDA, CCAI, Network +