What & how to manage after company formation/registration

Hi All Epxerts,

I am running a solo propretership IT company (service industry) of having turnover of around 20 Lacs and most of my business belongs outside India, most of the payment received in Dollars. Now, I am planning to convert it into a Pvt. Ltd. company, I know it takes hardly 15 days to register it but I have heard that there will be lot of hassles after company registration. Hence I have questions to clearify:

1. What kind of taxes I am liable to pay to goverment?
2. How & when I need to pay them?
3. Can I charge service to my clients outside India and if yes than how much?
4. Do I need to keep the invoice for the proof and do I need to ask my clients to sign it?
5. We are selling digital products too, so are we liable to pay VAT on them and service too?
6. How frequently I need to pay taxes?
7. Do I need CA services to file service tax or I can do myself?
8. How income tax I need to from the company's account?
9. I am the owner of the company, so am I also considered as the employee of the company?
10. How much salary I can withdraw and how to calculate that what will be the correct amount?
11. What about TDS and when I need to pay?

Your help much appriciated and can you help me company registration, how much will you charge? and what I will get in return?

Thanks you so much! Looking forward to your responses.