The current LP platform is quite clear and supports global free trade. How is the following unclear: "Efforts to forcibly redistribute wealth or forcibly manage trade are intolerable"?
As far as your other question, I don't think lack of taxes equates with anarchy. I don't claim to be speaking for the LP here, but I believe the vast majority of necessary government functions can be paid for by user fees--keeping in mind that this is a remarkably small number of legitimate functions. The rest can be funded one of two ways: either through ultra-low sales taxes or simply how any charitable institution obtains money: donations.
I think people would gladly contribute 5% of their salary for things like a judicial system, a national defense, etc. People will not voluntarily donate 50% of their salary to support a welfare state. Americans donate billions of dollars a year to institutions like the United Way or the Red Cross--is it so outrageous that they would not do the same to support certain functions of government?