I am just trying to get my yard in order after purchasing my house a few years ago. I have a lot of ideas I would like to do, but I am interested in a landscape designer to assist me. Does anyone know about how much they charge?
Prices are all over the map and will depend on the supply and demand in your immediate area ... and the amount of space you are designing. Call several and ask them what they charge. But before doing that -- since you "have a lot of ideas [you] would like to do" -- you might want to find some local landscapes that you admire and find out who designed them. That's your best bet for finding a designer who is one the same page as you.
Expect to pay somewhere between $200 and $5500, depending on the firm's pricing, what you get as deliverables, and the complexity and scope of work.