A paddle requires a keyer. Lots of choices there depending on what features you'd want. I'd recommend a K1EL but it seems he's out of the standalone keyer business. Since most HF rigs made in the last 25 years come with one built in, if you decide you want a station keyer get something with some feature set to it, e.g. memories, serial numbering, etc. Very basic keyer kits often don't allow selection of timing/mode so they're of limited benefit, other than better than nothing. For a bit of trouble on your part, you can load a ~$6 Arduino clone with free code off the web (K3NG, et al) and have a very well featured station keyer.
Mark K5LXP
Albuquerque, NM