WTB a blueprint of a blueprint machine to make new blueprints. ERROR: no trading in this channel

As pretty much everyone knows, the vast majority of manufacturing and trading in New Eden is made by and between players. This excludes a few vital items like skill books and original blueprints for space-crafting that player cannot create, for obvious reasons of recursion.
Allow me to bestow upon you several hours worth of experience with manufacturing and trading in EVE's world, and how I do things.
If you're a veteran Eve trader reading this, prepare your bib, because you'll probably be laughing at me so hard blood will splurt out of your nose.

The basics: what do you need to build stuff ? Only three things:

- Minerals

Even the most rookie player can quickly get a few million InterStellar Kredits (ISK) through mining, enough to buy himself a new pair of underpants...no wait, clothing items are bought with AUR, another currency. Where was I...sorry. I'm getting senile.
Since EVE:Retribution, the Venture mining frigate is a fantastic tool for beginners, just slap two mining lasers on there, maybe a mining laser upgrade module, don't bother with weapons or defenses, warp to an asteroid belt and get crackin'. Remember to train mining-related skills if you want to make a career out of it.

Now you have some rocks. Awesome! Whoo! space-rocks! Warp back to your space station of choice, and get refining! Immediately, you'll notice that you suck at refining: there's a lot of loss, and the station is taking a huge cut...so maybe you're better off buying minerals from the market early on, until you've trained up your refining skill (and subsequent ore-specific skills) and improved relations with the NPC corporation/empire owning the station by doing petty missions for them (assuming you're not in a player-owned station ..why would you try to learn from my feeble experience if you've got good enough connections to have access to a POS?)

Now you have refined minerals, hopefully the kind you need, and not only tritanium. Some wares like rigs reauire additional components you can only get from planetary interaction (a topic I know next to nothing about) and others from salvaging wrecks, but that's not important right now.

- a Station

Unless you've already trained Supply Chain Management, and I don't see a reason why just yet, you can't build anything unless you're docked at a station equipped with the proper facility. The blueprint and needed  materials must also be in that station's hangar. Just open the science and industry menu (alt-S), select your blueprint, from the blueprints menu, choose an installation for it, the number of items manufactured, and get a quote. If it seems acceptable, go for it, and pick up your finished wares when the job is done from the bottom-right corner button in the jobs window.

- Blueprints

Two types exist: blueprint originals (BPO) and copies (BPC). Only the former can be bought on the market, usually from NPC merchants, then you can make your own copies. although the copying waiting line in stations is usually several days long. Add to that the limited number of uses of a BPC as another nail in its coffin.
So don't worry about BPCs for now, maybe some day you'll want to build great amounts of a certain item at the same time, but for now you can just queue up a long production run from your BPO.

The most important things to keep in mind with blueprints when manufacturing for resale and profit are:

• How much the blueprint costs.
• How efficiently you can use the blueprint, ie. how much mineral will be wasted. Determined by skill and standing.
• The market escrow tax and transaction tax you will pay when selling them.
• What the usual market price is for the manufactured item.

Assuming you know how to do basic math, punch these numbers into a calculator, and voila, you have your profit margin per item sold.
I like to compare it to the cost of ores, and keep the margins as wide as possible. But of course, the free market is a harsh world for honest people, so you have to keep  a lookout on the shifting winds.
And remember, you're not making profit until you've paid back the BPO!