Initially individual illustrations of animal subjects to appeal to 0 - 8 year olds

Simple individual animals /transport characters/colourways to fit in A4 portrait with a blank 'text box' underneath so that we may add relevant copy. We want total copyright to all designs. Some examples of preferred styles attached. Please advise price for 1,2, 5 items and/or for the project which may be 30 or more characters eventually. The characters must be consistent in their style, ie it is obvious they are from the same 'family'. Produce with all relevant files so that we may amend at will. Advise software used and turnaround time. Please come back with any questions in case I haven't been clear. Thankyou.