What business structure is best for me?

It is fairly simple to keep your personal assets free from any liabilities of your business, as the owners of business entities (corporations and llc's are examples of independent entities; sole proprietorships are not) are generally not personally responsible for the obligations of the business (provided the business is run property, for example does not commingle its finances with the owner's personal finances, observes formalities such as having board of directors meetings and elections, etc.)  However, a determined creditor can, one way or another, reach the assets of a business owned by an individual debtor, however it is structured.  Even though the creditor should not be able to directly access the assets of your business if it is a corporation or llc, he/she/it will be able to reach those assets by (a)  either causimg your interest in the business (for example, your stock in a corporation) be sold in order to satisfy your debt; and/or garnishing any money you take out of the business entity as your compensation.  Moreover, if you were to transfer any money to your business or for its benefit (for example, if you paid the business's rent out of your personal funds) while unable to pay your creditors, it could be considered a fraudulent conveyance for which the business would be liable.