Joe's advice above is very relevant and the best explanations will come from your accountant.
However whoever led you to believe a ltd co was more or less the same as a sole trader must have been propping up the bar counter for too long that day.
The financial statements differ in style from ltd to sole trader, the filing with CRO is peculiar to companies, the taxation due dates are totally different, the taxation rates on companies and individuals are totally different, need I go on ?
If your company started July 2007 then your first year end would be June 2008. The taxation due dates for companies are (a) 21st of penultimate month of the company's financial year for payment of Preliminary Corporation Tax. (b) 21st of ninth month after the company's year end for filing of returns / balance of tax ( providing preliminary tax rules adhered to )
Additionally, for CRO purposes if the compnay was incorporated on or around July 2007 then the first CRO return ( without accounts ) is due within 28 days of 6 months of incorporation. The company will have an Annual Return DATE (ARD ) and the first ARD is 6 months from incorporation. Then the first ARD for which accounts will be due is then 12 months from there. However there are other rules on accounts etc. which your accountant will explain. e.g. the accounts must not be older than 9 months from the ARD.
The cessation of the sole trader means you will have part of 2007 on sole trader and part of 2007 as employee ( on P60 ) of the company. You will be filing a 2007 personal tax return in 2008 and those incomes will be filed on it. You will still have preliminary tax for 2007 and some calculation on that is needed. Again, you need your accountants advice.
AS you see, its not as simple as was said to you , but it's not overpowering. It can all be dealt with properly and on time with appropriate advice and a little explaining to you. Hope it all works out.