new at this

hey everyone, i am a 41 year old newby at this. my 14 year old son has a truck and talked me into buying one. i have ran his alot and i can now see why there are so many people in this forum. they are a blast, well i will have my new truck in a few days and i bought a e-maxx. i ,of course can not leave anything alone, so in saying that, where should i start with mods and please be discriptive? so you know i live in a rural area and have a lot of hills and dirt around me. perfect for this. thanks alot and i appreciate all the help i can get.