Promotion?

Hi, I'm wondering what the best idea for promoting my new business would be is? For instance, I'm thinking of just handing out flyers on the local high street - but are there any laws/rules for this? Also, I might as well just drop the flyers through letterboxes, direct to my customers? I'm thinking of backing this all up with some posters in select shops and locations.

Any ideas, tips and thoughts on this please?

Just promoting my website (which isn't completed yet) - could I just go to a shopping mall and start handing out leaflets??