*** 2Domains in Same IP? - HELP

[Cameleon]

1. Problem
Wheen i write my main server ip or my server host name in web browser it directs me to one of my website.

2. Problem
My other website directs to my first website, wheen i write *****anything_there******.domain-name.com in web browser., with www.domain-name.com or domain-name.com it is ok theen it points to good website. So only wheen i write anything before domain name. (I think it has something to do with subdomains configuration *meaby.
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I would like to achieve this*: Wheen i write my server ip or host server name it points to /www/vhosts/default/htdocs page (default plesk page). Same if i write *****.name_of_my_second_domain.com.

So basicly i want to correct it because it should be like this from begining. I search'ed on this matter whoole server in config files and other stuff, but i didnt found any settings that could correct it.
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Thanks for any information where should i look for that configuration.