I am sure robbie will weigh in on this sooner or later as well..but here is my take...we charge by the hour unless it is a small job..the rate will depend on what your market segment will bear...here we can get $250/hour all day long...you have to take into account the price of the skidsteer which is between 48000-55000 depending on what you get...we bought the RC100 with the forestry kit on it with out the fecon cutter that you can have preinstalled on it and it ran us 52500.00 with a bit of haggling...the cutter heads will run between 18000-27500 again depending on what you buy and how much haggling you can do....consider what you want to do..if you want to clear land fast and arent as worried about the finished look (like if you are clearing for development) then look at a hammer type cutter (Loftness Carbide Cutter...Fecon..Tushhogg...FAE...etc) If you are looking for a more finished look (like when you are clearing up the woods or trying to clean up land for property owners or realestate...then look at the Loftness Timber Ax which cuts the debris into smaller pieces...either way the price isnt gonna change much they will be in the range I named for you...we have a F350 Duall Diesel with a Hudson 7 Ton deck over trailer...the trailer was 3500.00...you will need insurance both on your equipment (theft..damage..etc) to keep the bank happy unless you can finance this all out of your own pocket in which case can you loan me a little?

I dont know the exact number we pay each month because its tied into our business policy for another company we own...
The speed with which you will be able to effectively clear a lot will depend 100% on how you run your machine and what cutter you choose...we have Timber Ax and there are links to some pics of a small job we did in another thread here that Robbie started...the job in the pics took us about 2hours not counting time taken to
cut by hand around the bigger trees where the cutter couldnt get..
This is a potentially profitable business but just like anything else its work..running the machine is only the beginning..I am lucky in that I dont have to worry about quoting jobs or figuring costs or doing any of the business end of the deals...I just run the machines and do the work..
Hope this helps you some and whatever I missed I am sure Robbie or someone will come along and help you with...
BTW
The thread with the pics is titled Mulching Project