It's of great help thru Duolingo
I've always been that kid who wants to start doing some extra-work for myself, but only a year ago, I found myself addicted to watching American TV shows ('cause I'm an all-day-wanting-to-get-new-things Chinese kid) and I just can't get enough of it, then I guess I'd learned real quick in the whole process and I finally got to a satisfied standard that I'm looking for. BUT, that's so not enough of it, I wanna get Spanish, French and German as well!! So I noticed there's this super awesome APP Duolingo, I practiced along with it this whole week and it's really been a great help to me, and I don't even know how to show my gratitude for'em, it's like a life-saving tool, for real! And I will be keeping track of everyday so, I'm being very confident is all that matters!
Another problem is that the pronunciation in Spanish, especially the 'r' and 'rr', really bother me a lot, how to speak correctly? whatever I try to pronounce them, just seems not so right, so someone tell me please!
To English speakers, the common advice is to try to say "Prince of Prussia" while replacing all of the r sounds with d sounds instead and work up from there.
I don't know enough about common sounds and what sounds are involved in Chinese to know if that kind of approach would actually do you any good at all. I'm under the impression that the English "r" sound isn't made with the mouth in exactly the same way as the Chinese equivalent, so it's possible that'll be useless for you.
You might want to try looking up "Fluent Forever". The author of that has Youtube videos going over the International Phonetic Alphabet and how we actually make the various sounds of English (including things like whether they're voice, where the tongue should be, etc). If you nail down the English pronunciation of r it might help. Or maybe if you search in Chinese for something about the Spanish r, you'll find suggestions for tricks to help you get there a little more directly.