Drupal 6.x

Good Day.
I want a situation where I can create menu, content and other stuff and the menu or content can only be visible to some set of user group. I need a module that can do that for me. Please help.

We are a non-profit club running drupal 6 on our website (ncfossilclub.org). Our web hosting company has updated their php version and is requiring us to upgrade to a newer version of drupal. We are looking for someone that might be willing to assist the webmaster in this upgrade

I got a simple menu with four items. When I click the first it shows me five subitems. When I select the first subitem from this list, it shows me the content, but the whole menu collapses so that the submenu items are no longer displayed. If I choose the second submenu item, the menu stays open so that all the submenu items can still be seen. The third to fifths submenu item behave like the first.

When I look at the submenu settings, all is equal i.e. none is checked as opened.

When i attach and upload doc file in node. It is only visible when i view it in login mode. But when i log out and view the page it is not visible. My site is in Drupal 6.0.

I have creted a block view in D6 and placed its link in the right column. When I click it the result is displayed in the main content area, but I want it to display in the right column as well. How can I accomplish that?