I need some answers about WRC

[Rallyper]

Yeah, but you're not required to win your national championship to step onto higher levels, and it doesn't mean you don't have the skills. For example Kalle Rovanperä and Oliver Solberg started rallying outside their home countries

Never said that. I´m speaking generally for a person knowing zero from beginning...

[Jarek Z]

For first question, If driver wons national championships, will driver participate WRC? Is there something like that?

No, there is no such rule.
Rallyling is different than other (normal) sports. For example - in light athletics you need to have good results in your national championship, then you "get promoted" to European Championship, then to World Championship and Summer Olympics. In rallying you can compete in any championship you want, even if you have no skills.