Hi, my ds started solids at 15 weeks and 18lbs and boy was I freaking about it!!!
We started with baby rice watered down with his formula at lunchtime - I was told that this is the best time to introduce new food as lo should be pretty alert (hopefully in good humour!) plus if it disagrees you find out during the afternoon instead of in the middle of the night.
After the rice, we did purees - carrot, then pear, sweet potato, cauliflower, apple and peach (but the last two we mixed with the baby rice to make a creamy dessert, as the taste weas a bit too sharp on it's own for ds). The only thing the health visitor warned me about (apart from the usual stuff) was no wheat/gluten before six months. Also, tomatoes are quite acidic, and I found that one out the hard way several stinking nappies and one upset child later! Also, at first, we introduced one new food a week to make sure he was OK with it. DS is now 10mo and so far eats pretty much anything but refuses the prepared food you get in jars - he wants to eat the real stuff.
I have one of the Annabel Karmel books too but only got it recently - though she does give good ideas for purees and stuff.
The best advice I would give would be buy a hand blender and make your own, filling up ice cube trays to put in the freezer - it's really handy and less waste. Also, if ds is hungry, you can just pop out an extra cube. I found when ds started waking for night feeds or was wanting more milk during the day that was the time to start adding meals (we added dinner, then breakfast).
Good luck!