Recipes Guide - https://www.pathofexile.com/forum/view-thread/15223
List of guides put together by POE fans - http://www.pathofexile.com/forum/view-thread/371292
Taking your time and tackling the aspects of the game slowly and surely is the best bet. It takes some time to learn and remember the important things and when you think you've learned enough, you still have more to go. It took the first 4 or 5 months playing POE to get my bearings around the different aspects and still needed to go to google every now and then to look something up.
The outside mods for trading are allowed but don't use anything that helps in game because those are "illegal" will give you viruses and get you in trouble with GGG.