Accounting expert needed

Hi I'm looking for accounting expert in following areas. Assets equals Liabilities plus Owners Equity Income statements and balance sheets calculations Adjusting And Closing Entries Repetitive transactions Accounting Basis Cash Accrual Depreciation methods Straight-Line Sum of Years Digits Double Declining Balance DDB, where no salvage value is considered Accounting For Inventory Help Systems Periodic Perpetual Valuation Methods Last In First Out (LIFO) First In First Out (FIFO) Average Cost Accounting For Merchandising Help Purchasing and selling on credit. That’s where the accounts payable and accounts receivable emerge. Returns And Allowances Cost Of Goods Sold (COGS)