CONGRATULATIONS!!! my it be the first of many for you.
Re pricing,what size is it? Most of mine are A5 size and personalised.I started selling those for £1.50, but everyone said I was under charging, so now I charge £1.50 for an A6 size card and £2 for the larger,tall or square cards. I do give 10% of that to the Downs Syndrome group I attend for dd.
Do a quick tally up of how much it cost for material to make sure you cover that,and try to judge a price depending on how long you took to make the card.
I don't sell that many, so perhaps someone else will be along to help you!
Well done again!