Disclaimer: I'm not pro, I did read up a bit on sin pvp, and did it for a little bit. Post if I'm wrong, so OP has the right info
Randoms pvp shit could help catch you up:
-Attacks on the move, know which attacks will root you to that spot, and which you can use while chasing. The key is to get gud at chasing closely and baiting remove shock. Don't forget once its popped, there is a few seconds you cannot stun them again, so bait it out as mentioned and KEEP a rune bury on them, it's your fight to control.
-Know your skills and everything that can do for you, some ports will remove slows ext..
-You have to know your opponents class and skills, pro-lvl you can get to know them by animations.
-Always mark you opponent with a "1" and have a hot key to select "1" fast, the greater the gap created, the more likely you are to be eaten alive.
-Macro your armor sets.
-as mentioned above** don't start off with "gap closer skill" and weaving increases GS procs by a lot.
-Know when to use "killer's eye" attack boost and MA/ACC boost for one attack.
-"Calming whisper" when attacking a temp or sin and some others, this skill is OP and hated on for it. Temps will QQ bc pull won't happen.
-Use self healing attacks on mobs only, not on players unless your in non mob area.
-Its ok to turn and run, but you should have to run for more than 10 or so seconds to have your CDs back up.
-certain classes have chain skills which its worth a dodge, def a SW thing imo.
-You can be effective in Attack/Crit set, using buffs properly. Best first set.
-Sorc's like to port behind you and immediatly CC you, if you come out of hide and try to blow up a sorc, come out with you 2x spelldodge on, or cast after port. I never got this one down right. If you stun a sorc, they can Tree you with no cast time. This could be bad advice, but I'm amateurish and or sorc fight isn't easy.
-Hiding II has pro's and con's, going w/out it will really challenge you if you depend on it too much and every Sin should attempt this.
-Always record when your about to PvP, aion = hax and helps everyone legit out.
-Accept you are YEARS behind certain players and not everyone is hacking, so don't rush to that conclusion every. Expect to die a lot and expect taunts from no-lifers, its just the game's culture to be a baddie.
-Your AOE's can burn off an opponents dodge skill and can be very usefull for Rangers/Sins especially. - Almost all rangers start off with a dodge up, or pop into hide for first hit.
-You can use silence to burn off a sins or rangers dodge as well, you can cast it from a descent distance away.
-Have a bow, put a slow proc stone in it, socket MA. Or beast bow if you got $$ bc aion p2w.
-Create a chat windows that detects "enemy's buffs/skills, attack ext.." and keep it open with a bright font, it can save your life, if you miss the lag spike from the enemy player.
-GS are your friend, the fast you can get Silence and Blind, the better you are. Starters 2x Silences if you p2w, they work on all classes. Blind should only be used against melee. Pop a discord with blind for melee if you can't get better, they pop quite a bit more than silence imo.
-Know players can "hear" you buff up, As a cleric I switch to block set fast when I heard them. Playing with music will hurt your gameplay a little. Certain skills have certain sounds as well, but I never got to that lvl of pvp.
-Download "Shugo Console" for better battlefield vision -Download "aidps" , If it still works.
-Weaving: Just google it, there are a plethora a vids and you can't entirely explaining through text. Also learn how to create a weave box with a chat window, its good for starters when you practice on dummies. Mik87's post was pretty good though.
-There is a sick ass "everything about sin" sin tutorial in the Aion forums the is semi-recent. You will have to dig for it bc forums are trash. Its very good, from Sofya or something like that.
Sorry if this info is incorrect, I felt like dumping a few things I knew and practiced and I don't promise they are all correct.