I have to admit the urge to be a bit sarcastic when answering a question that shows a complete lack of interest in the topic the questions is about.... but I won't be.
First off, Logic Pro is designed to use a keyboard for midi data input, so yes, there is a way. You can buy something as simple as a little Korg Nano keyboard, all the way up to a Yamaha Disklavier, depends on how much $$ you want to spend and how many types of features you want.
Before you go into deciding any of this stuff, I would suggest you take a look at Mac Pro Video for some tutorials so you can get a better picture of what can be done, and what the tools are you will want to have/use.
the best this I know for a basic overview of Logic is the little manual that comes with the application, Exploring Logic Pro. You can get it here if you lost your install boxes:
http://documentation.apple.com/en/logicpro/
Also, a quick google search regarding midi brought up this:
http://leftandwrite.com/brian/music/beginners_guide_to_midi.php
Might be a good place to start looking for the info you need.
Now, all this said, you will have to spend some time reading manuals, or even a few magazines (Future Music or Computer Music magazine from the UK has a DVD included with each issue that has great articles on midi, sequencing, synth programming, etc).
These types of products (Logic Pro) are so complex that you are required to invest some of your own time learning. Because this time I was nice, and I'm sure some others will also be nice. Some people on the other hand, would tear you a new butt for being so lazy to ask a question like this when there is SO MUCH information available to get on the internet with such a SMALL amount of effort on your part.