What I want with google chrome browser, when it starts is:

• Open a few tabs, including "new tab page"
• open 2 tabs which are "locked"

How can I do this?

for the first part in the options you can set multiple websites as homepage. the new tab page is chrome://newtab

for the second part you know the drill edit the chrome shortcut preferences and add in the target field after everything --pinned-tab-count=2 or any number you wish

hope i helped
cheers

In version 5.0.307.1 dev all pinned tabs are locked.
You do not need to use --pinned-tab-count=x anymore

Great!! It worked both

Thanks!