It sounds like you are in a bit over your head. Not to be rude but you may benefit from a training class to get a hang of some of the basics of working with an edit system.
Still to answer your questions. You can use a firewire cable to transfer from your camera to your computer. You may need to buy a firewire hub or a pci card that has some extra firwire ports. My guess is you are on a laptop if you only have one port. If that is the case a hub may be the way to go. You might also be able to use something like this https://www.bhphotovideo.com/c/product/437092-REG/SIIG_NN_EC2012_S1_2_Port_FireWire_400_ExpressCard_34_Expansion.html .
Your camera has a 4 pin port so you will need a cable that goes from 4 pin firewire to six pin or 8 pin depending on your computer.
I personally love using memory cards rather than tape because it is so much faster to transfer. That would be my recommendation but tapes are a lot cheaper to buy.
You will want to make sure that you set your scratch disk to the external firewire drive you are using. If you don’t Final Cut will save all of your files to your computer’s internal hard disk.
Lastly you can use one of Final Cut’s easy set ups for HDV. Just pick the one that matches your frame size and frame rate. For example if you shoot HDV in 1080 30 P use HDV 1080p30 FireWire Basic. Make sure your camera is plugged in and turned on in VTR mode before starting Final Cut. If it’s not final cut won’t recognize the camera. Then you will use log and capture to capture your footage. If you use the cards you will still use the easy set up as above but you will use file log and transfer to get the files.
My policy is to always capture and edit in the same format I shoot in if at all reasonably possible. The less transcoding the better. Since you are shooting HDV you should have no problems. Final Cut handles that like a champ.
If you decide to use tape and edit a lot buy a deck. You will wear down your camera heads using it as a deck all of the time.
I hope this helps.