Before you can determine what your going to charge, you have to first ask yourself why anyone would hire you since there is already those around you in business already, you need to figure out what your competitions weakness's are and focus on those, if its poor quality work, do good quality work, if its they don't show up when they say, do the opposite and show up when you say you will, if its low price work your after, your going to go broke fast. Just because you advertise doesn't mean you'll have business and paying customers, all those that don't pay will be the first at your door, you really need to say no to those on day one, the last thing you need is to do work for dead beats that don't pay and take up your time, if you do work for them and take them to court to get paid, it will scare off good customers.
I'd recommend you keep a day job and work your way in slowly and figure out what is needed in your area and how your competition functions before relying fully on doing this type of work full time.
For what its worth, I quit advertising years ago, all I got was people who wanted the cheapest bid possible, then complain when it didn't work or wouldn't pay the bill, word of mouth was the best for me and has been for over 15 years now, can't keep up, can't get it all done and always have a list to work off of, which brings about the next problem, you'll lose work due to not getting it all done, with rainy days, breakdowns, problems at the jobsite beyond your control for delays and the list is endless, people talk and even if its not your fault, you'll be blamed just the same, so pace yourself and don't take on too much at any one time, all anyone cares about is their project and it getting done, they never care your busy with someone else's job and theirs has to wait, so saying no not at this time is upfront and honest, people will accept that for an answer, it will also let them know they need to contact you ahead of time and know if they want you to do their work, they might have to wait a while till you get to them, this works for some, not for others.
We charge a moving fee and then hourly off the hour meter, keeps things really simple, especially when we're working on a dozen sites at one time, with weather delays and etc, we just drive to another site and keep working with more sets of equipment is how we found works best for us, otherwise your constantly loading and unloading and moving and getting nothing done anywhere it seems.
For what its worth, an old timer once told me, if your good at what you do, you can basically charge whatever you want and people will pay it verses hiring someone else who does poor quality work, over the years I've found that to be very true, but as they say first you have to prove yourself and get a name established for yourself and a reputation. Best of luck on your business startup, the first few years can be really rough, so hang in there.