I've never done one of these, but done a few others.
To connect to the injectors, you should be able to use some silicone pipe with a tight, push on fit.
By the look of things, the left hand injector just has one leak off connector (so no problem with that one), but the other three have double connectors to string them together, so you'll need to bung up one side of each connectors spill offs (short pipe with a bung in it will do or a rubber cap).
Or if you are feeling flushed, buy three of these to replace the double connectors for the test.
http://www.ebay.co.uk/itm/FIAT-BOSCH-COMMON-RAIL-INJECTOR-90-DEGREE-LEAK-OFF-CONNECTOR-3-piece-KIT-/281043555242?hash=item416f8053aa:g:znEAAMXQ01tRPNX8
Or you can just use two pipes on each side of each double connector stuffed into the same bottle, it'll still work as long as you individually catch each injectors spill off in separate bottles.
Cut your hoses the same length and bung up the normal return pipe back to the pump/fuel filter so it won't draw in any air.
You really need fairly small (like 100ml) measured containers to spill into or some way of measuring smallish liquid amounts accurately.
Containers with tops that can be drilled and the pipes stuffed into work well, also mark them up which is which.
My bottles are screwed through an old numberplate with some string to hang them up.
As for the test, it depends on who you ask, most say just run it up at idle until you start to fill one around half way, then compare all four, but you can repeat the test as 1500 or 2000 rpm for a 1 or 2 minutes if you want to be sure.
They should all be within around 10% of each other, but it's usually obvious if one has a problem as they often fill up your container pretty quick.
Here's a rig and test I did for an X Type a few years ago.
Obviously, the connectors are different and the normal spill pipes aren't stringed together on this Denso system like they are on your Bosch, but you get the idea.
http://www.jaguarforum.com/showthread.php?t=60446
