Early in this guide you need to make your way to the Dalaran crater. Your guide makes it so much more tedious than it needs to be if you the mage in question has the Ancient Teleport: Dalaran spell.
If the mage does not have that spell, then the guide is okay though you say to buy the Goblin Glider kit from Rickit. We don't need it. We have the Slow Fall spell.

Zygor Guides Viewer v6.1.16245
Guide: LEVELING\Legion (100-110)\Legion Intro & Artifacts
Step: 775

--- Player information ---
Race: Goblin Class: MAGE Spec: Frost Level: 110.00 Faction: Horde
Position: Hillsbrad Foothills /0 30.67,36.88 (#24, zone:'Hillsbrad Foothills', realzone:'Hillsbrad Foothills', subzone:'Dalaran Crater', minimapzone:'Dalaran Crater', micro:'', texture:'HillsbradFoothills')

--- GUIDE ---
Guide: Legion Intro & Artifacts
Type: LEVELING Parsed: yes Fully: yes
Startlevel: 100 Endlevel: nil
Next: nil

--- STEP ---
map: Hillsbrad Foothills#24 /0
floor: 0
needsreload: false
current_waypoint_goal_num: 3
requirement: Mage
isFocused: true
level: 0
beta: false
(incomplete, POSSIBLE, not aux)
Goals:
1. "Enter the building"
action: goto
waypoint:
prepared: true
was_clicked: false
dirtytext: true
was_visited: false
map: Dalaran #1014 /10 0.5287,0.5197 >10
Status: passive (not completable)
2. "Enter the Chamber of the Guardian"
action: goto
waypoint:
prepared: true
was_clicked: false
dirtytext: true
was_visited: true
map: Dalaran #1014 /10 0.4922,0.4758 <1000
Status: passive (not completable)
3. "Run down the stairs"
action: goto
waypoint:
prepared: true
was_clicked: false
dirtytext: true
was_visited: false
map: Dalaran #1014 /12 0.413,0.6478 >10
Status: passive (not completable)
4. <Click Portal to Dalaran Crater>
action: click
waypoint:
was_visited: true
prepared: true
was_clicked: false
dirtytext: true
map: Dalaran #1014 /12 0.288,0.7743 <1000
target: "Portal to Dalaran Crater"
Status: passive (not completable)
5. <?>
dirtytext: true
tooltip: Before clicking the portal, talk to Ricket, the goblin standing near the portal, and purchase a glider.
prepared: true
was_clicked: false
was_visited: false
Status: passive (not completable)
6. <?>
dirtytext: true
tooltip: Use the Goblin Glider Kit after taking the portal to avoid dying from the fall.
prepared: true
was_clicked: false
was_visited: false
Status: passive (not completable)
7. "Meet Archmage Modera in Hillsbrad"
action: q
dirtytext: true
count: 1
waypoint:
was_visited: false
prepared: true
was_clicked: false
map: Hillsbrad Foothills #24 /0 0.2874,0.3733 (no dist)
quest: "An Unexpected Message" ##40267 goal 2: "Meet Archmage Modera in Hillsbrad" - quest in log (id: not completed)
Status: incomplete (incomplete, POSSIBLE, 0 progress, not aux, 'quest goal num below count')

-- Travel Route --
1. [2653] "Hillsbrad Foothills 30,36" = Hillsbrad Foothills 24 /0 30.7,36.9 [start] (closed) (context:walk_start__useitem_misc) (t=0.0/0.0)
2. [2650] "Dalaran 60,44" = Dalaran 1014 /10 60.9,44.7 [misc] (closed) (mode:useitem from [2653]) (context:useitem_misc__walk_portal) [my t=36.7/36.7] (t=36.7/36.7)
3. [885] "Portal" = Dalaran 1014 /10 49.3,47.6 [portal] (closed) (b/o:bd) (mode:walk from [2650]) (context:walk_portal__portal_portal) [my t=8.6/25.9] (t=45.3/62.6)
4. [886] "Portal" = Dalaran 1014 /12 63.4,23.9 [portal] (arrival) (closed) (modeortal from [885]) (contextortal_portal__walk_end) [my t=75.0/75.0] (t=120.3/137.6)
5. [2651] "An Unexpected Message" = Dalaran 1014 /12 41.3,64.8 [end] (closed) (mode:walk from [886]) (context:walk_end) [my t=8.4/25.1] (t=128.7/162.8) (waypt: Run down the stairs)