You're Right to own a Warship mentioned in the Constitution

Article I, Section 8, of the Constitution authorizes Congress, “To… grant Letters of Marque and Reprisal …;” , Thus empowering the legislative branch to authorize "private parties" to seize and hold assets of foreign enemies.

Arms is short for Armaments
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What did "well regulated" mean when the Second Amendment was written?

Lets look at a dictionary from that time period... The following are taken from the Oxford English Dictionary, and bracket in time the writing of the 2nd amendment:
1709: "If a liberal Education has formed in us well-regulated Appetites and worthy Inclinations."
1714: "The practice of all well-regulated courts of justice in the world."
1812: "The equation of time ... is the adjustment of the difference of time as shown by a well-regulated clock and a true sun dial."
1848: "A remissness for which I am sure every well-regulated person will blame the Mayor."
1862: "It appeared to her well-regulated mind, like a clandestine proceeding."
1894: "The newspaper, a never wanting adjunct to every well-regulated American embryo city."
Well regulated = In good working order

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The meaning of the Second Amendment

Right to Bear Arms.... not NEED
Arms = Ordinary Military Equipment 
Bear= Carry
Militia = Not enlisted, not contracted armed citizens
Regulated = In good working order. As in well regulated clock.
Shall not be infringed = No Restrictions