If it is just basic collision detection and (non realistic) response you probably don’t need a physics engine.
IIRC Farseer is Box2D based . The Farseer site recommends the Box2D tutorials as a starting point. Scanning the "Getting Started" section of their site it looks pretty similar in syntax to Box2D in Java or C++. Box2D is really easy to learn.
If you want to be adventurous and time isn’t an issue you can always code you own physics engine – It is a lot of fun and you will learn a lot :).