@Adair M thank you for the advice... i am just a newbie in the bonsai community... i am on the process of learning.. its more of a research for me so that i would avoid making some mistakes and kill a tree in the process... i am in norway and most of the wild species here are common junipers which is very temperemental... and some urbandoris being used as a fence like himalayan juniper, chinese juniper old gold and etc... i have some future yamadori projects to do so im trying to learn the most i can... as of the moment i collected this small size juniperus communis this year in the mountain. Excuse my low pictures...
Nice bones. Yours have pretty green foliage. Those growing naturally here are a little bit silver or blueish.
Here is my beginning...
http://www.bonsainut.com/threads/11th-floor-common-juniper.23043/
Nothing mutch to advise. People really say they are unpredictable and can die for no certain reason. Nick Lenz has a very good chapter about common juniper in his book Bonsai from the Wild, he says to be careful and avoid doing too much in one session...
I've collected three. First one was potted with original root ball in original heavy clay soil. Your black soil looks better. It grew fine first season, I did some light wiring just to open the canopy and some light pruning. It died in the fall.
Then I collected two... One with an interesting trunk and the second as a back up tree...is in my thread. After collection they were bare rooted and potted in terramol.
The better trunk was left without any insult. Lived one season. The second was treated without any respect. The dead veins cleaned and some branches wired in the fall. Not saying this is the way, one wants to live one doesn't. I prune it as stated in linked needle juniper articles. But conifers live from green. It's always good to let the tree go wild one-two years after collecting for root growth. I did prune, but very selectively, never all new growth, for example one branch today, next branch after few weeks... always leaving some growing tips... and we have one popular love song in my language I always sing when working on my c. juniper. The song is called "Till I have you".