The LED television has the same installation as other flat screen televisions. The only minor difference is that LED screen do not do good in direct sunlight. So the television must be installed out of direct sunlight.
Cheap television stands can be purchased just about anywhere. Many stores like Big Lots or Walmart or even Target have cheap television stands. Also Target has these.
Dell is a well established and highly regarded company. You can compare their TV's against others here: http://web.consumerreports.org/tvs/v2/index.html?EXTKEY=SG72E00&CMP=KNC-CROELECG&HBX_OU=50&HBX_PK=flat_screen_ratings
The best wall mount is going to one that is properly sized for your television and that will be able to hold the weight of it. You also want to consider if you will want your mount to be able to more or tilt. A sales associate at your store should be able to assist you in properly choosing one.
All camera DVDs are different, so check each individual camera and store for availablity and warrany information. You may be able to purchase additional warrany information.