You'll probably want a Firewire>USB3 adapter. Pay attention to your cam file format to make sure software on your PC can open those files. Lots of "How To" tutorials about transferring Firewire files via USB so search for them.
I have a lot of Sony 8mm tapes I want to download to my Dell Inspiron 24, Model 3459 Series, all in one desktop. I have an old Sony Handcam with Firewire hookup. However, there is no firewire connection on my desktop computer so I need to install a firewire card.  The problem is when I took the back off of the desktop as far as I can tell there is no were I can install the firewire.card.  Is there anything I can do short of buying a new computer? .  
Installing firewire card on dell Inspiron 24 Model 3459 Series