Hello Everyone

Could anyone give me some advice on Pantone Colours and Printing.

I had some business cards printed but they were not set as a pantone colour therefore, everytime they print they look different.

I have found a colour I like, but it is a pantone coated colour, when you look at the colour sample for the same colour but uncoated, it looks very different.

For things like business cards, posters and compliment slips, should the pantone colour be coated or not. Also will the colour vary depending on what material it is printed on i.e silk business card to compliment slip.

Also, I have been told that all printed colours must be in pantone colours, yet when you look through exhibition programs etc. there are many product images or photo's of models...how does that vary. I am looking to have images included on posters .

Sorry if this is a basic question but I seem to have got lost in the world of printing!!!!