How many types is too much? I'm a newbie btw
First rule is don't put the cart in front of the horse. :) First learn the "how-to" of growing from seed, the methods, the equipment, and the steps required. That takes time and practice.
Then pick 2-3 easy-to-grow items and practice with them. Once you are successful with them and have fine tuned your methods and equipment then you can expand your list of seeds to try.
That way you avoid getting discouraged and giving up on the process.
Here is a link that might be useful: Growing from Seed FAQs
My grandmother started me at about age 4 by putting some soil in a fruit jar and sticking some beans and corn down between the soil and the glass so that I could see what was happening. She pointed out the difference to me between dicotyledons and monocotyledons -- she never learned to write her name so I rather doubt, however, that she called them monocots and dicots -- but, you see, the educational seed was planted too.