Hi Unicorn666 and welcome to the forum. You will find lots of information here - it sometimes takes a bit of finding, but it's worth having a good search around the different threads.
I'm not in either of the fields you mention but please be aware that it is VERY hard to make money in Spain. We have almost 20% unemployment and if you don't have fluent Spanish then you are very restricted in your choices. I imagine most electricians can scrape a living working with the expat community (I'm sure there are experts here who can tell me if I'm wrong) but teaching would be more difficult if your partner doesn't have fluent spanish. If you are self-employed you need to pay around 250€ per month for Social Security, even if you are not earning a cent. This does however entitle you to full health care which is a big issue here at the moment.
You do have time to learn some spanish though and who knows what the economy will be like in 2012!
When I moved out in 2008 I was advised that you needed at least one year's money in the bank and I now feel this is an underestimate - I think at least 2 years in the current crisis.
There are lots of people going back to the UK just to find work so do as much preparation as you can. Choose your area carefully - if you need to work with the expat community then you need to be near them - and spend as much time here on holiday over the next few years to get a clearer idea of what it is really like.
All the best with your plans and I do wish you every success. Although money is not easy to come by and the cost of living is higher than you might think, it is a wonderful place to live and I have never regretted coming here to stay!
Keep us posted!