First post, so please don't bite. You all come across as a friendly bunch so I'm sure I'll be fine.

Basically, i'm new to all this. Did a couple of kits which were pretty bad, so moved onto allgrain which has meant pretty decent improvements, but my efficiency is pretty low and seems to fluctuate a fair bit. Anything from 55 - 70%. So one thing led to another and I started reading my water report. Things got pretty heavy when I opened the brunwater calculator!
In any case, the reason I am here is to ask some simple questions. I live in a area with "very soft" water. My report is below. From what I gather this can be seen as a good thing as I can create water profiles based on whatever I want to brew, but a bad thing in that I need know how to do that. So really, all I want to know, should I not bother for now as a relative newcomer and concentrate on something else, or will some simple adjustments help? From what I gather the calcium is very low and this is important, so maybe just work on increasing that?
I did kinda of get my head around the brunwater calculator but not in a way that me confident to start putting all sorts of stuff in my beer.
The other question is how I calculate alkalinity, this seems fair confusing as I am not sure where to even start.
Anyway, thanks in advance.
Si
A water report sample below (full report is here: http://www.unitedutilities.com/waterqua ... ode=sk25qa)
Parameter Min Average Max Units
Calcium 10.6 12.8 16.8 mg Ca/l
Chloride 6.97 9.98 12.1 mg Cl/l
Copper 0.0026 0.0306 0.110 mg Cu/l
Iron <2.97 <39.0 171 µg Fe/l
Magnesium 2.60 3.04 3.70 mg Mg/l
Manganese 0.140 <2.13 29.1 µg Mn/l
Nitrite <0.0016 <0.0023 <0.0095 mg NO2/l
Nitrate 2.04 2.71 3.72 mg NO3/l
Sodium 8.50 9.84 11.5 mg Na/l
Sulphate 22.4 26.5 29.3 mg SO4/l