How do you make constructs???

Okay, so I consider myself a fairly experienced player (been playing for at least 2 or 3 years now). For the longest time, I stuck to paladins, with a few brief steps into fighter, cavalier, or a very martial cleric. Recently, I've been branching out a bit more (a ranger, an inquisitor, a barbarian, a bard), and I thought it might be interesting to play a construct crafter. So, I dusted off my Ultimate Magic and read through the construct creation sections. And then reread them. And reread them again.

I recognized all the words, but I have no idea what they're saying. I kind of get the idea, but I feel as they they're missing several steps somewhere. I don't know. Are the rules unintentionally vague, or am I just missing something? If the rules in the book are vague, have they been redefined somewhere else? I would really like to play the construct crafter, but the rules just seem too convoluted.

Before looking at ultimate magic I would try making a normal construct first. That book just has rules for other options.

Once you get the craft construct feat all you need is time, and money.

They are expensive though, and unless UM allows you to upgrade their HD after they are created they may not be worth the trouble.

So where are the rules for making a normal construct? The only set of rules I could find governing construct making was UM.

Beastiary 1. Craft Construct Feat.

Craft Construct (Item Creation)
You can create construct creatures like golems.
Prerequisites: Caster level 5th, Craft Magic Arms and
Armor, Craft Wondrous Item.
Benefit: You can create any construct whose
prerequisites you meet. The act of animating a construct
takes one day for each 1,000 gp in its market price. To
create a construct, you must use up raw materials costing
half of its base price, plus the full cost of the basic body
created for the construct. Each construct has a special
section that summarizes its costs and other prerequisites.
A newly created construct has average hit points for its
Hit Dice.

Crystal has it. The feat tells you what you need to know.

The construct in question will tell you how much it cost, so if you want to make an Iron Golem you need to look it up in the bestiary to find the cost for the body and raw materials.