Just wrote a long message and then computer turned off...right
First thing I guess to ask is do you own a mac or pc?
More and more people are using mac's for music nowadays for a number of reasons but don't worry you can get a great set up with a pc laptop or desktop.
first thing you'd want regardless is a soundcard/audio interface (soundbox as you call it)
http://www.dv247.com/computer-hardware/m-audio-fast-track--68396That one is an Maudio fast track and it's a great price and will give you everything you need.
It has the ability for you to record a guitar and vocal at the same time for say a live performance.
It obviously then can be used to keep adding whatever tracks you wanted to record into your computer whether it be 2 or up to 64 tracks which I doubt you'd get to.
It's also a great unit as it's usb so just plugs straight into you computer without a hitch.
A great feature on it is it has "phantom power" this is need when you buy certain mic's which need powering, often called condenser microphones, they're very common and the maudio will power these fine. You can of course you a more standard mic "dynamic" it tend to be called.
So yep that's a good unit
The next thing is to decide what DAW you would want.
This is the software with your mixer and general control of what you've recorded and where you would mix your tracks.
There are loads about, Pro tools, Logic, Sonar, Cubase, ableton list goes on and all are good
I use a mac and use logic but for pc I honestly think that the pro tools free software that comes with the maudio would do you to start with just to get going.
They all basically do the same job but some come with more software instruments and plugins.
Plugins are just fx such as reverb, delay, compressor e.t.c they can come in handy making the recording sound nice, louder, or anything you want really to just mess about with.
Software instruments are brilliant things, most people use them with a midi keyboard (you can get usb one's now) and then these software instruments can be piano, bass, loops, strings sounds, that you can add to your recordings.
How's that for starters?
One thing I would say is post up your computer or laptop spec so people on here can tell you what your machine is capable of handling when it comes to boring stuff like ram, gb's e.t.c
hope that helps