Can anyone offer me some of their brain to pick...?

We have a recruitment budget of about £20k to spend on media advertising this year. With this money we want to pick up between 150 and 200 committed givers at about £15 p/month. The scheme we're recruiting for is sponsor-ship style and therefore quite tangible.

Can anyone help me with any of the following questions:

1. Which MAGAZINES might generate good response rates for charity recruitment ads (theme: children/African development)? Are there any that are really worth splashing out on?

2. Which magazines/newspapers have a policy of offering sizeable charity discounts or last-minute knockdown (or free) offers on ad space?

3. Anyone had any joy in local newspapers?

4. Inserts vs. ad space? Which one tends to perform best?

5. Is it better to spread ads throughout the year or block book series of ads in particular seasons?

6. Is there much of a difference in response rates between mono and colour?

7. What works best as a response mechanism - a cut-out form to be returned to charity, or a tel number/web address for enquirers?

8. What kind of creative works best for donor recruitment? Is it best to stick to tried and tested formulae or be a little innovative?

Any other golden nuggets of advice would be greatly appreciated!

Thanks :)

Luke, International Care & Relief