Choosing Data Types Correctly

Hello, I am really dripping wet behind the ears on this and would really appreciate some help. I am setting up my first SQL table and am lost at trying to choose data types for my fields. Basically, all I am doing is setting up a contact form. It is going to ask for phone number, name, address, city, state, zip, etc. I will also have two fields which if I were using an Access db, would be "memo" with say, 500 characters. So in researching SQL data types, I came across the following:

char
Fixed-length non-Unicode character data with a maximum length of 8,000 characters.

varchar
variable-length non-Unicode data with a maximum of 8,000 characters.

text
Variable-length non-Unicode data with a maximum length of 2^31 - 1 (2,147,483,647) characters.

nchar
Fixed-length Unicode data with a maximum length of 4,000 characters.

Can someone shed some light on what I need for simple fields like street, name, city, and more importantly, description? I will also have a "premium" field which should be a "yes" or "no". I am thinking a data type of bit, which is set to 1 or 0? Thanks for any help, I appreciate it so much.
TOm

varchar(100)


char(1)