Ebo

Deffo get their brochure, it's epic with every page printed on every grade and finish possible so you can touch and feel. In addition they are the only company I know of to offer Digital Embossing, real 3d texture on the face side

For the stationery I would use Illustrator or good old PhotoShop; I only dig out InDesign for multipage. Most printers want a 3mm Bleed with 5mm gutter and accept PDF at 300dpi, but some want 400dpi.
 
I use RCS for production, their artwork guide is pretty good and they offer an pre print check, guaranteed turnaround (if they mess up you get it free) etc ... to be honest I never recommend anyone but to say I have been using them since 2002/3 ish should say volumes.

Vector CMYK, 300dpi, full scale print quality pdf with no compression.
 
Gutters and bleeds will be different for each printer, but typically sit around 3mm. Double check with the printer of course.
 
Also make sure if you're using black you actually mix a CYMK black at C-75 M-68 Y-67 K-90.
 
You can use K-100 and shift the CYM around the 50-70 mark to change from a slightly cooler to warmer black, but don't rely on C-0 M-0 Y-0 K-100 as that's dark grey on most print. It's ok for body text though.

Hi
I don't do much print work, either, but here is what I do:
Ask the client which printing company they will use. Then see if the printing company have some special requirements and guidelines. Most of them provide blank templates for business cards and letterheads, etc, so if you can download these, it should be pretty easy.
 
There were some standards UK templates, but can't remember the link, try and have a quick search in Google for AI/EPS/PSD blank stationery templates.
CMYK / 300+ ppi resolution.
 
Keep in mind I do business cards / logos only occasionally, so I might not be aware of everything that's required

Welcome to the forums!
 
Times are hard for a lot of web workers, there is plenty of work around, but a lot of people chasing it!
 
Prices are hard to set, though £150 a day seems resonable for your skillset, and being in London, if you work 2.5 days a week on average that will earn you around 20k per annum.
 
I'd say get stuck into adapting your skills to use HTML5, spend as much time as you can learning how to work with the new elements, you'll be better off for it.
 
One avenue you might want to explore is specialisation. You mention working with Wordpress, which is great, but there's a huge amount of competition in that sector because it's popular, so finding that sort of work will be increasingly difficult. Have you looked into other avenues such as http://www.movabletype.org/ and http://www.movabletype.com/ - that could open up private and (possibly lucrative) commercial work.

Nice to meet you, Ebo

I like your work As I said things will get better, so don't give up

Hi E. Welcome to WDF.
The transition from HTML4/XHTML to HTML5 isn't really that hard. The markup is easier and more logical. And regarding CSS3: Just see it as a lot of new features and new selectors to use in your styling. If you’re producing good semantic XHTML the new standards should be easy to adapt. Every web designer/developer is in a constant process of learning new technologies. And when we finally master one standard a new one comes along. So don’t drop your prices.