Don't worry about the implicit params, those are filled in by the compiler. All you need to do is provide a key and value type, and a path. Look at how sequenceFile gets used in this test:
In particular, the K and V in Spark can be any Writable class, *or* primitive types like Int, Double, etc, or String. For the latter ones, Spark automatically uses the correct Hadoop Writable (e.g. IntWritable, DoubleWritable, Text).
I'm having a little trouble deciphering the docs for