Just started playing AL a few days ago, I noticed and I felt that as of now I can't say that I can tank a whole party, maybe Tomb 1 possible but Tomb 2 and higher nope.. someone called me noob at wt3 then i left the party, but i told them before we go that i can't tank yet.. Guys I need your help/suggestions on what to do with my supposed to be PvE warrior Build, use for farming/securing my partymates etc.

Questions:
1. Should I buy now (lvl 17) equips on store or auction?
2. Should I wait til i reached 20++ before i buy something?
3. My plan is to buy 100pcs ++ of health pots.. do you recommend it?
4. Do you have recommendations for me to boost my defence/health and to tank and be alive longer (equips/techniques)

Warrior Level 17

SKILLS
Vengeful Blood (max)
Skyward Smash (3 no range, no mana)
Windmill (4 no snare)
Horn of Renew (4 no taunt)

STATS
Strength: 195
Bonus Dmg: 198%
Health: 2253
Damage: 51.4
Dexterity: 31
Ddge: 2.55%
Critical: 1.78%
Intelligence: 20
Mana: 300
DPS: 57.9
Armor: 529

PvE
Kills: 1056
Deaths: 40

EQUIPS:
(rare) Weapon: Holy Blade of Tenacity: 23dps, 15str, 8int
(epic) Helmet: Protector Coif of Fitness: 15str, 8dex, 200armor
(epic) Armor: Guardian Armor of Will: 16str, 8int, 310armor
(epic) Ring: Steel Braid of Fitness: 16str, 8dex, 19armor
(epic) Amulet: Steel Pendant of Assault: 17str, 9dex, 2.8damage

All replys will be really appreciated. thank you in a davnce.. btw this is my first post so please be nice to me