Hey, I'm new here, and just created a silkroad charcater yesterday

[On Venus, cause I hear they have a big legit population, cause apparently this game is bot-infested = / ]
1.
I'm a Euro Wizard, I want my 2nd class to be a Cleric...how and when can I do this? Or do I just add skill points into there cleric book when I get them?2.
Also, I'm going to be following this guide to build my character, umm...is it good? lol. I was just wondering if it was out of date or anything because some of the skills mentioned on the official silkroadonline site aren't there. [well its a wiz/cleric guide - some of the cleric skills closer to the right of the 'bar' aren't mentioned - is it because i can't get them as a WIZ/cleric?] And I mess up my character in EVERY game !
I really dont want that to happen, so could you guys give me your two cents on that guide?Thanks so much! I appreciate your help so much.