Lyle,
My advice since you are a new PC holder would be to find some of these bush strips close to you, obtain all the details for each; such as strip length, strip surface type (gravel, dirt, long grass, short grass etc), condition of the surface (rutted, undulating), obstacles, power lines, strip altitude and most importantly slope. Completely avoid one way strips to start with (you wont be insured if you have an accident at one). Once you have all the details, grab your instructor and have him go over all the performance calculations to determine how many of these strips are suitable for your aircraft.
Then have the instructor review with you, climb performance for your aircraft, especially the effects of density altitude. Have the instructor show you correct 'precautionary' and 'short field' techniques and practice them at a familiar strip. Then have your instructor fly with you to your first bush strip and instruct you through the process.
This way your instructor can review with you all the dangers associated with bush strips. I don't know much about the J120, but I am reasonably certain they are not an 'ideal' bush strip aircraft, but will certainly be able to get into and out of any bush strip that meets the performance limitations for the J120. Be especially aware of the climb performance and clearance of obstacles typically found at bush strips. Even the trees some distance from the strip will be a clearance issue at high density altitudes.