Hey, guys. I´m new and I need help with tips and advice. Do you have any?
Read the tips, keep chugging through the lessons (if you just stop doing them you may feel like you've stagnated and want to give up), practice a lot, keep your skills gold and review them even if they are, if you know you're weak on them. Just keep practicing, and don't get upset with mistakes! Mistakes are how you learn. Good luck! :)
Followup: As someone who learned the hiragana system for Japanese a long time ago, I can tell you that the best way to remember it is writing it down. Make flashcards, download an app that shows stroke order (arguably more important for the kanji and Mandarin characters, but it can still be helpful) and make flashcards to take with you on the go (or use Tinycards but I don't, personally).
Welcome to Duolingo.
Here are some useful links, to get more familiar with Duolingo:
Duolingo Wiki for "Getting started"
http://duolingo.wikia.com/wiki/Getting_started Please, read from: The language "skill tree"
"Duolingo Wiki and FAQ"