Preservative/ additive free diet. Where do we start?

[Calluna]

Hi All,
Before my DS starts eating solids, I want to change our diet to one that has as few preservatives and additives as possble so that we can set a good example, and hopefully improve our own health in the process. We're also vegetarian (mostly - DP and his family are and I usually just eat with them, although if we eat out I'll usually have some meat.).

Do we just stop buying canned/ packaged foods and go for the organic stuff instead?

What about things like cheese, milk, bread, pasta, etc. How/ where can we get the healthy versions of these?

What about costs? We're pretty limited on funds at the moment can we get this cheaply or is it going to cost us the earth?

What about healthy alternatives to take away, I know we can make our own pizza but what else?

DP is worried about getting bored, I've tried to explain that there is millions of things we can do with fruits and veges, but DP is sceptical about this whole idea. How can I convince him this is the right thing to do. I'm sure it is, isn't it?

Any recipe ideas would be great too.

TIA
Heather

ETA - I had a look for a similar thread(s) but found it hard to fish through all the info.