I want to practice landings, and I want to know if theres any addons that can start my aircraft in a direct approach to land at a runway that I can chose.

Lord of the Landing V1.6 : Landing Training Environment for FSX.

 

A SimConnect application to help repeated landing training in various weather conditions,

and analyze and evaluate your landing data.

FS INSTANT APPROACH: FSX RUNWAY APPROACH MAKER

 

 

http://secure.simmarket.com/fs-instant-approach-fsx-runway-approach-maker.phtml

There is also FS Instant Approach here.

 

http://www.fsinventions.com/

I use Instant Approach, its easy to use, great product.