How to go about turning a freshly dug up juniper (from the ground) into a bonsai

I have a large juniper that I found in the back of a nursery owner. The juniper was perfect for an informal upright specimen bonsai. I am not just to sure how to go about transforming it, help is greatly appreciated.

A-A, hope you found it in the back of the nursery, and not the nursery owner!!! The best thing you can do mate is to buy yourself a book or two on bonsai. Read them cover to cover. The short answer to your question is:

Slowly

The long answer is something you're unlikely to get anyone to spell out for you in its entirety, but if you ask a question like this, best you add a photo or two. Start by keeping it watered well (1st thing to read up on). Evenly moist throughout the soil volume, but not permanently soaking wet and not bone dry either. After watering, search for "juniper bonsai guide" and read up on the tree's requirements. Get it healthy and keep it healthy and then worry about styling etc.

Now, where's them photos . . . .

Cheers

Was this dug from the ground at the nursery and potted? If so, just sit and look at it for a year as you water and fertilize it back to health. And, as Andrew said, get some books. See if you can find a nearby club.

thanks guys, and it was dug from the ground

If it was first dug from the ground then the short answer is do nothing for a year. Get it healthy again, using a good watering & feeding regime and sited in good sunlight where it can photosynthesise. You know if juniper are happy by the emergence of runners - shoot elongation. Watch it this year and see if the tree is starting to recover & respond positively. Put it somewhere you walk by often so you can see it and turn it so you can see it from all angles (tilting it too as you can change planting angle). Gradually you will come up with a plan. Read a lot about juniper care and maintenance. The stone lantern book on Junipers is a good reference point as is the numerous threads here and on bonsainut.