Warlock items are obtained from MOS market only or buying them from players if they sell.
What benefits i get from that gear ?
None, Warlock equipment is good as any normal gear, that you can find through grinding, crafting, forging etc...
Just saves you some time.
How i can get higher level than 10 Warlock items?
You need to enchant those items.
Warlock items can be enchanted up to +14-+15
Enchanting is done at anvil, same was as normal gears.
NB: Warlock items may break during enchanting.
https://forums.mo.ee/viewtopic.php?f=3&t=11 -> Enchanting guide.
Monk Wand

After that you need to choose if you want to turn want into staff or scepter.
- Required magic level
10 Magic -> Monk Wand
15 Magic -> Monk Wand +1
25 Magic -> Angelic Wand +2
35 Magic -> Serpent Wand +3
40 Magic -> Gorgon wand +4
45 Magic -> Legendary wand +5
https://forums.mo.ee/viewtopic.php?f=3&t=11
Formula for scepter +6 creation.
NB: Required Legenday wand +5 and 2 stone of evolution.

Resurrection scepter

- Required magic level
50 Magic -> Resurrection Scepter +6
60 Magic -> Unicorn Scepter +7
70 Magic -> Kundun Scepter +8
80 Magic -> Imperial Scepter +9
90 Magic -> Starfall Scepter +10
95 Magic -> Reaper Scepter +11
105 Magic -> Misage Scepter +12
110 Magic -> Moonlight Scepter +13
115 Magic -> Nemesis Scepter +14
120 Magic -> Oracle Scepter +15
Formula for staff +6 creation.
NB: Required Legenday wand +5 and 2 stone of evolution.

Misery staff

- Required magic level
50 Magic -> Misery Staff +6
60 Magic -> Ancient Staff +7
70 Magic -> Divine Staff +8
80 Magic -> Demonic Staff +9
90 Magic -> Starfall Staff +10
95 Magic -> Reaper Staff +11
105 Magic -> Misage Staff +12
110 Magic -> Moonlight Staff +13
115 Magic -> Nemesis Staff +14
120 Magic -> Oracle Staff +15

- Required magic level
10 Magic -> Monk hat
15 Magic -> Monk hat +1
25 Magic -> Monk hat +2
35 Magic -> Monk hat +3
40 Magic -> Monk hat +4
45 Magic -> Monk hat +5
50 Magic -> Monk hat +6
60 Magic -> Druid hat +7
70 Magic -> Druid hat +8
80 Magic -> Druid hat +9
90 Magic -> Druid hat +10
95 Magic -> Druid hat +11
105 Magic -> Druid hat +12
110 Magic -> Druid hat +13
115 Magic -> Warlock hat +14
120 Magic -> Warlock hat +15
Warlock Robe

- Required magic level
10 Magic -> Monk Robe
15 Magic -> Monk Robe +1
25 Magic -> Monk Robe +2
35 Magic -> Monk Robe +3
40 Magic -> Monk Robe +4
45 Magic -> Monk Robe +5
50 Magic -> Monk Robe +6
60 Magic -> Druid Robe +7
70 Magic -> Druid Robe +8
80 Magic -> Druid Robe +9
90 Magic -> Druid Robe +10
95 Magic -> Druid Robe +11
105 Magic -> Druid Robe +12
110 Magic -> Druid Robe +13
115 Magic -> Warlock Robe +14
120 Magic -> Warlock Robe +15

- Required magic level
10 Magic -> Monk Robe Bottom
15 Magic -> Monk Robe Bottom +1
25 Magic -> Monk Robe Bottom +2
35 Magic -> Monk Robe Bottom +3
40 Magic -> Monk Robe Bottom +4
45 Magic -> Monk Robe Bottom +5
50 Magic -> Monk Robe Bottom +6
60 Magic -> Druid Robe Bottom +7
70 Magic -> Druid Robe Bottom +8
80 Magic -> Druid Robe Bottom +9
90 Magic -> Druid Robe Bottom +10
95 Magic -> Druid Robe Bottom +11
105 Magic -> Druid Robe Bottom +12
110 Magic -> Druid Robe Bottom +13
115 Magic -> Warlock Robe Bottom +14
120 Magic -> Warlock Robe Bottom +15