Your English is fine. I wonder where you are. There are stores that sell Star Trek stuff, there is a lot of stuff online, and there are even sets in some places. You can buy uniforms that range from very cheap (which don't much look like the uniforms on TV to ones that run hundreds of dollars. Patterns to make your own are also on sale. There are a variety of props available as well. Does he own all six series (Star Trek (The Original Series), Star Trek: The Animated Series, Star Trek: The Next Generation, Star Trek: Deep Space Nine, Star Trek: Voyagers, and Enterprise)?
Are you looking for gift ideas? Party ideas? Where in the world are you?