Hey Hi! Congratulations on your new 3d printer. For modelling, if you are not already a designer it would take you few weeks to understand how it works. I would suggest if you are new, go for free software's like Googlesketchup or Openscad, there are many other open software's out there, but I personally recommend these. And like I said you can also get free 3d models online, which you can then modify using the free software's; you can find 3d models at Google 3d warehouse & GrabCad. So, there you go, don't let your ideas go in vain make use of them. p.s. The how to videos on YouTube are very very useful, you should go check it out and spread the word, Bye.