Ill admit I'm a greenhorn
6 big trees maples oaks 75 ' max
Pruning to encourage new growth
remove alot of dead limbs
help
"Encouraging new growth" is NOT a reason for pruning.
If these trees have never been topped, hacked, or mangled before, they'd probably be better served by only removing dead, dying, diseased and damaged limbs, and if possible, not cutting them back to the main trunk if there are good laterals available (for damaged limbs)
If you do the job, be careful of dropping limbs or blocks on top of good healthy limbs, or they'll be damaged too....
As far as what to charge...
Figure out how much you need to make per hour for your time. Figure out how long the job will take you to complete. Figure out what your expenses for the job will be. Figure out how much profit you need to make to be able to stay afloat and grow.
Add it all up, and you have your bid/estimate.
This isn't a good business to by on your own while you're still green. Before you worry about how much to bid the job for, how do you intend on completing the job? Do you already know where each cut will be, and how you'll be getting there to make it?
Since they're not removals, you're not planning on wearing spikes/gaffs are you?