I just started learning how to use UDK this week, so you aren't far behind me. I suggest if you want to learn the best way is to head over to the /r/rocketleaguemods subreddit where they have aggregated a bunch of great guides and tips to help you get started! I also highly recommend Wejrox's YouTube series. Good look and have fun modding :)

RocketLeagueMods: https://www.reddit.com/r/RocketLeagueMods/comments/4wzunj/everything_you_need_to_know_about_rocket_league/

Wejrox's series: https://www.youtube.com/playlist?list=PLvhilV-QKVLQVtH_sxbcfQ-Mct-GBBVb9

hey i already saw them,but thanks! I´ts just your quarter pipe have a perfect angle, i would like to use them to make something similiar and would love to have those ramp,because the flow is great,im getting used to it. i would give you credits in my mod ofc. If not its okay, thats all :)

For the quarter pipe I just used a curved staircase with a 90 degree curve (using the parameters given on the rocketleaguemods subreddit). You are welcome to try and pull it from the .udk file that you should be able to find in your workshop files if you've downloaded the map. Good luck!