Time & Staff management spreadsheet

Excel spreadheet or Outlook / google calendar or other best medium I need to be able to manage people, tasks and time. The company I work for has asked me to deligate duties to other team members. All of the duties will be time allocated as we are paid on a time basis p/h (or % of hour). Each of the tasks will be related to an individual client of which there can be x clients. There can also be x amount of staff members that duties need to be passed onto. I myself have 127 effective hours per month. Each one of the above hours will be allocated to any task, whether it be internal, or 'gold card' time, which could be the undertaking of any task. (reading, proposal) Each member of staff that I delegate a duty to could be from a different team within the office. Copywriter, search, design, admin etc. There could be any amount of tasks per day and for anyone. The purpose is so that I can be given projects, work out how much time each project will take and organise the entire month in a couple of hours and get the data down into the spreadheet. I work 5 days a week, monday to friday 9-5 for 4 weeks a month.