Thank you. Another scenario:If Clone enters as Kazandu Tuskcaller when it is on level 5:1) Does Clone enter the battlefield on level 5 or he has to start on level 0?
706.2. When copying an object, the copy acquires the copiable values of the original object's characteristics and, for an object on the stack, choices made when casting or activating it (mode, targets, the value of X, whether it was kicked, how it will affect multiple targets, and so on). The "copiable values" are the values derived from the text printed on the object (that text being name, mana cost, color indicator, card type, subtype, supertype, expansion symbol, rules text, power, toughness, and/or loyalty), as modified by other copy effects, by "as . . . enters the battlefield" and "as . . . is turned face up" abilities that set characteristics, and by abilities that caused the object to be face down. Other effects (including type-changing and text-changing effects), status, and counters are not copied.
2) In either case, if I don't own any forrest [sic] does it mean I cannot have Clone go up to level 6?
No, I am not a judge. That's why I like to quote sources such as the rules that trump judges.