I studied advertising at college and uni - the mains points in advertising are -
Firstly - you need to determine if you are going to advertise a product, or your business. Lets take McDonalds for an example - sometimes they will advertise a burger, and every now and then, they have an advert out which simply reminds the viewer of McDonald's, they aren't selling anything, apart from the fact that they exist.
So If your advertising your business what do you need to do?
1. Create awarness - show people that your business exists.
2. Give them the information the need, just a small amount of information so they visit your site to get more.
3. Get to know your viewer - most people won't buy from you without any trust. Trust is needed to sell - you can gain trust through
Auto-Responders, these will send messages to them whenever you want them to giving FREE information, thus starts building a trusting relationship with your viewer.
4. Re-assure your viewer that your a 'big business', and your not after 'one off' sales.
5. Make sure that your advert sticks in the viewers head - this way they will tell their friends about you. This can be done by having an outrageous advert. Example - think of an advert you have seen, and were like WOW, and you spoke about it with your friends - this is what you need!
Selling a product;
This is basically same as above, however all the information needs to be about the product you are selling. Do not overload your viewer with loads of products at once - they will become confused. Remember, you have the knowledge and they don't, do not overload them with too much, it will scare them off.
Again here you can use your
Auto-Responder, build up a trusting relationship, then start sending them emails about products, maybe 1-2 a week.
This can all be implemented with one program, I like to use
Aweber because it is cheap and effective. There are other Auto-responders out there.
Hope this helps

and good luck with your adverts.