The general rules for your questions are: (1) Property acquired prior to the marriage normally remains separate property. (2) Separate property sold during the marriage remains separate if it is easily traced to other property (e.g., a $5000 car is sold, and the $5000 is used to buy a boat). (3) Proceeds from a sold item, which are used as a partial payment for another item, will sometimes (but not always) be credited upon dissolution of a marriage. (4) Gifts to the marital couple are normally considered community property,
Caveat: There are exceptions to all these rules. It would be best to consult with an attorney.