Well, your problem regarding ls: '.': No such file or directory‘ is because, there is no home dir on HDFS for your current user. Try
hadoop fs -mkdir -p /user/[current login user]
Then you will be able to hadoop fs -ls
As per this warning WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable, please see my answer at this question