Nice! First gold is always special.
A quick rinse should clean it off nicely. 10k indicates 10/24 purity gold by weight. So if it weighs 3.6 grams, calculate 10 / 24 x 3.6 = 1.5 grams pure gold by weight (I'm using 3.6 as an example, don't know what your ring actually weighs). With a spot price of $1400 (I use Kitco.com for info), 31.1 grams/troy oz. would mean $1400/ 31.1 x 1.5 to give you an approximate value of the gold content. In this case $1400 / 31.1 x 1.5 = $67.52. So you won't get snookered by one of these "We Buy Gold" places, if you should ever decide to sell it.
You should be able to find a nice acid test kit for under $20, but I prefer to do a density test as you don't have to deal with the acids and it isn't destructive to the item.