Citrix XenApp Deployment

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http://serverfault.com – I am new to Citrix and am thinking of proposing a Citrix solution for our home and remote office workers. My question is regarding deployment and licensing. To allow the clients to have remote application deployment via Citrix XenApp do we need to buy anything in addition to the Citrix XenApp and Windows Server 2008? Is there additional Citrix software/licensing that is required? Do we need to purchase Terminal Server licensing or is this inclusive with Windows Server 2008 (for TS Server side) and Windows XP/Vista/7 (for TS client licensing)? Do I need Citrix Presentation Server? Thanks (HowTos)