Where and What to get?

LOL I am so new to all of this and it seems that many of you know about a lot of this. I am looking to get a SSL Certificate. Basicly we will be selling a Newsletter Subscrition on the site. Nothing else. What kind of Certificate do we need as I have seen that there are different levels I guess you would say and does it matter where you get it? Are some places better than others?

Thanks for any help!!
Heidi D

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