A good first step would be to restore the Articles of Confederation - which left the individual states within the confederation sovereign, as opposed to being the vassals of an all-powerful federal authority such as we suffer under today.
Next, a few explicit statements about the proper role and limits of government authority, such as:
* The sole and only legitimate function of government is to maintain the peace; to protect individuals from harming or threatening harm to others; to assure that legally binding contracts are respected and that the rule of law applies equally to all.
* Men have the right to liberty and property honestly acquired; to free association and freedom of speech; to pursue happiness as they see fit, without interference, provided they harm none in so doing.
* Necessary revenues for the operation of legitimate government functions, such as the law courts and police, shall be derived exclusively from tariffs on goods, sales taxes and so on. No tax on income, from whatever source derived, shall be lawful.
* No man shall be debarred the right to possess firearms for self-defense or any other lawful purpose, nor shall any government authority enact any law restricting the possession of firearms, with the exception of those duly convicted of a serious crime involving the use of violence or its threat.
* No individual shall be compelled to provide material or other benefit to any other man; no local, county, state or other power of government shall have power to enact or enforce any law, statute or policy that does the same. No man has the right to live at the expense of another, via the force of government.
* Allodial title to real property shall be inviolate; all taxes on real property are forbidden.
* No law shall be enacted or enforced restricting or forbidding what any adult individual may do with or put into his own body.
* The franchise shall be restricted to citizens who are property owners/taxpayers who have passed a basic test of knowledge.
Just for openers...