First, visit any trainer in the main cities of old Azeroth - just ask a guard, and learn Apprentice Engineering. Northrend trainers can also teach you every recipe from 1 to 450.
This recipe goes yellow at 20, so get enough materials to use this recipe 40 times.
You will need 34 of these later.
Visit your trainer, and learn Journeyman Engineering.
You will need 15 of these later.
Visit your trainer, and learn Expert Engineering.
and
20 x [Whirring Bronze Gizmo] - 40 Bronze Bar, 20 Wool Cloth
You will need 40 [Heavy Blasting Powder] and 20 [Whirring Bronze Gizmo] later, and if you make these you should reach 150 skill point.
by making them now, you might get a lot further - probably towards 160, then stop making these and only make more when you'll need them.
The recipe will be yellow, so you might not gain any skill up, but you will need this item later. You will have to make only one of this, don't make more if you don't gain skill up.
1 x [Gyromatic Micro-Adjustor] - 4 Steel Bar
Extremely cheap! On my realm it costs 1 gold/stack. Save some of these, because you will need it later.
Visit your trainer and learn Artisan Engineering.
Engineering has the option at skill level 200 to specialize in Gnomish or Goblin Engineering. The main difference between both sides is the location of their respective teleporters and the ability of their trinkets. Some items require a specific specialization to use, while other items are crafted by one specialization but are usable by any engineer. Fortunately, most recipes that are crafted by one Specialization can be worn by both.
Save these.
Save these.
Save these and if you don't reach 260 by making these, make a few more [Mithril Gyro-Shot].
Go to Outland or Northrend,visit your trainer, and learn Master Engineering
.
10 x [4 Elemental Blasting Powder] - 20 Mote of Earth, 10 Mote of Fire
Save these.
15 x [Fel Iron Casing] - 45 Fel Iron Bar
You will need around 15 of these later, but I suggest you to make these until it goes grey, then only make more when you'll need them.
Go to Northrend, visit your trainer and learn Grand Master Engineering.
You will need around 50 [Handful of Cobalt Bolts] and 36 [Volatile Blasting Trigger] later. Make these now, and you should reach 375 or probably more. Note that when you craft [Handful of Cobalt Bolts] you can get 1 or 3 bolts, and the same goes for [Volatile Blasting Trigger], you will get 2 [Volatile Blasting Trigger] each craft.
35 x [1-3 Handful of Cobalt Bolts] - 70 Cobalt Bar
18 x [2 Volatile Blasting Trigger] - 54 Cobalt Bar, 18 Crystallized Water
10 x [Overcharged Capacitor] - 40 Cobalt Bar, 10 Crystallized Earth
8 x [Explosive Decoy] - 8 Frostweave Cloth, 24 Volatile Blasting Trigger
You will probably reach more than 400, then stop making these and make more only if you need it.
15 x [Froststeel Tube] - 120 Cobalt Bar, 15 Crystallized Water
5 x [Diamond-cut Refractor Scope] - 5 Froststeel Tube, 10 Handful of Cobalt Bolts
5 x [Box of Bombs] - 25 Saronite Bar, 5 Volatile Blasting Trigge
25 x [Saronite Razorheads] - 50 Saronite Bar
Make [Global Thermal Sapper Charge] between 425-435, if you are a Goblin Engineer.
7 x [Mechanized Snow Goggles] - 56 Saronite Bar, 14 Borean Leather, 7 Eternal Shadow
When you reach 435, you can make your [Wormhole Generator: Northrend] and your epic Engineering Helm at 440, however if you want to level your Engineering past 440, you should wait with both until 448, because there are only green recipes at that point, but the Goggles and the [Wormhole Generator: Northrend] are still orange.
You will probably need to make more than 25 of these.
25 x [Gnomish Army Knife] - 250 Saronite Bar, 25 Skinning Knife, 25 Minning Pick, 25 Blacksmithing Hammer
1 x [Wormhole Generator: Northrend] - 8 Titanium Bar, 2 Eternal Fire, 2 Eternal Shadow, 2 Eternal Water, 2 Eternal Air
I hope you liked this Engineering leveling guide, GZ to 450!