Just a few tips:
-DO NOT BUY ACCOUNTS ON SYTHE! At least not from anyone who doesn't have ALLOT of rep to lose from scamming.
-If it seems to good to be true, IT IS. There's always a catch, always a way you end up worse. If it seems to good to be true, drop it, no matter how tempting it may seem you'll just waste your time/end up losing god knows what.
-When doing trades that involve you taking risks, such as account sales, account training etc. ALWAYS trade with trusted people.
Definition of trusted is simply a scam free, extensive background on sythe with a ton of vouches. Either that or an official status of mod/official goes for trusted. 400+ posts is nothing but 3 days of no life spamming, and vouches can easily be forged. ALWAYS do a background check.
Other than that all that matters is experience, the ability to spot a scam from far away, and to know who is trusted and who isn't.
Good luck in the future, hope that helped a bit.