Do I need a web developer or a web designer? How do I go about picking the right one for me?

Firstly, Google about web developers and their firms.
Secondly, ask your friends and relatives if they are familiar with any web developers or not.
Thirdly, short list the ones that match your budget and needs and then before you assign them as your official web developer, do see their portfolio and meet up previous clients to get their reviews.
Hope this helps. Good luck!
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Creative Ecommerce Web Design Co.

You also need to visit some tutorial website.

web design

Better you contact some web development company. they can offer you a better deal
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