Trust me you want to have originality something that no one else can legitimately take credit for. Like ross said record your ideas and brainstorm. Adventure maps are very open ended leaving a ton of room for creativity and design!
Nice to meet you ethlu09 ill be sure to check out your content. Best ways to get noticed are to post often on the forums, and comment on other peoples work!
As nick said no one will be able to join this, if you want to make a public server, I recommend finding a host. And if your looking to play with friends you trust I guess you could use hamachi.
if your in your console you type. Say without the / because it wont run. Console already runs the command as soon as command line is written no slashes needed.
Just wait until you get over 5 people then you will see the effects of you bandwidth. Also not the best idea to post your hamachi password and such on a public forum.
I agree with doppelich when posting something like this please provide some kind of photographic or video proof of safe-installation and proper function.
On my old account my first submission was a little skin I made when I first started playing. And at the time I didn't really know how to make skins, and I think some of those submissions were most likely rip-offs XD. But I tried pretty hard to keep content out there and stopped for a long time. Until recently and I made a new account.