how do i make the perfect fondant pumpkin...

roll a ball of orange fondant into a ball, flatten slightly if you'd like and then add lines with a toothpick or fondant tool.

Here are two tutorials.

http://www.mysweetandsaucy.com/tag/fondant-pumpkin-cupcakes/

http://baking-decorating-cakes.suite101.com/article.cfm/how_to_make_a_fondant_pumpkin

HTH.

Don't forget to add a stem, pumpkins are easy to make and very cute