Linode is an Unmanaged service so the staff aren't there to help you set up your LAMP stack, they keep the hardware and network running.
There is however an extensive library provided by the staff here
http://library.linode.com/ with guides on how to set up LAMP stacks etc.
You can also find community support in the forums an IRC channel.
Many people here use Linode for what you want to so you wont have trouble finding support.
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Paid supportHow to ask for help
1. Give details of your problem
2. Post any errors
3. Post relevant logs.
4. Don't hide details i.e. your domain, it just makes things harder
5. Be polite or you'll be eaten by a grue