If you need any help or if you have suggestions on how to improve certain things in Redkit, feel free to write in the Redkit forums ( http://forums.cdprojektred.com/forums/8-Redkit ) and I am sure you will get answers. Redkit may be overwhelming at the beginning, but it is very rewarding if you really decide work with it.
Just a tip: Don't start with the original levels, since they are very complex. If you have an idea for a small quest, just build a nice hut, a forest around it and two or three npc's and make it work. If you have a nice story in your head, you don't need complex storylines with multiple choices, vast landscapes and an army of NPCs. Sometimes less is better, especially if you're just starting your personal adventure as a modder.