I have written the following articles few weeks back. One thing I would like to add on to these articles is the patching order of Forefront UAG 2010.
You must have a base build Windows Server 2008 R2 SP1 with all Microsoft security and critical updates. you install the UAG from the this source Forefront_UAG_Server_2010_64Bit_English_w_SP1 with correct product key from Microsoft volume licensing center.
The following the order of patching UAG before you start configuring UAG.
3. UAG-KB2288900-v4.0.1269.200-ENU
4. UAG-KB2585140-v4.0.1773.10100-ENU
5. UAG-KB2710791-v4.0.2095.10000-ENU
6. UAG-KB2744025-v4.0.3123.10000-ENU
UAG Articles:
Part 1: Install and Configure Forefront UAG Step by Step
Part 2: Publish RDS using Forefront UAG 2010 Step by Step
Part 3: Publish Exchange Server 2010 Using Forefront UAG 2010 Step by Step
Part 4: Redirect Web Application from HTTP to HTTPS using Forefront UAG 2010 Step by Step
Part 5: Publish SharePoint Server 2010 Using Forefront UAG 2010 Step by Step
Blog by Raihan Al-Beruni 
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I need help how to deploy Client in TMG 2010 Standard version and deploy clients in users machines to connect to TMG 2010 Standard Version Gateway in Windows Server 2008 R2 X64 bit .
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On the details pane, click the Networks tab>Right-click the required network, and then click Properties>On the Forefront TMG Client tab, select Enable Forefront TMG Client support for this network, then follow this url http://technet.microsoft.com/en-au/library/cc441585.aspx
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