Having that outfit on a trailer is a good move as the price you pay for such a roomy setup is weight. Itchenor is a good place for a start, I cut my teeth in that area many years ago when a kid as we were lucky to have friends with a creek fronting place at West Wittering.
As you are trailing you might find transom wheels aren't needed, perhaps just get some inflatable rollers in case you need to pull out in unexpected circumstances away from the launch site slip.
As you've been about with a friend on the sea (I assume) then you should know the basics but the "which kit" thread makes for a good read.
Beyond that ask anything that comes to mind, there is good experience of outfits like yours on here.
When you first get out we all like to see a few photos uploaded.