TOPIC: "to help build up "

Can you explain more on my sentence "... to express your idea to help build up our website""to help build up " (here does"help" represent "adj" and "build up " represent a "verb"?
...to help to build up... will be still correct or not.

You may recall studying that certain verb can be followed by an infinitive ("to" +the base verb). "Help" is one of those verbs that needs to be followed by an infinitive ,so the correct full form would be "help to build....",