Starting a company

Hi all, 

I hope you don't mind that I write in English, I can read danish but writing it is very slow and I'm sure I can express my self better in English. 

I have just started my first company and I have couple question I haven't been able to find an answer. If any of you can help me, I would highly appreciate it!

1. My company is a webstore and I'm wondering about paying methods / providers. Is epay the best solution for it? I have tried to compare different options and it seems that paying a certain amount of a month (99-199kr) is more profitable than paying some % from each sell. What are your experiences from it?

2. I'm thinking about using my own extra bank account as company bank account. I have an "extra konto" next to my main bank-account and I handle all the companys money true this. Do I have to let Skat or any other place to know that this is the account that my company use? Or does Skat only cares about the booking I have to send to them every 3-9months? (Depending of course how much my company make).

3. I'm ordering my products out side of EU. I think I have already registered as importer, but how does this at the end works? My shipments at the beginning are not big the value is around 3000-5000kr / shipment. I know I have to pay the custom % but do I also have to pay the mums in advance? Is there anything important to remember? How about if I want to make bigger order, like 20 000kr-30 000kr? Is there any different. I'm not using a middle hands, but the order comes straight from the provider true post.

4. I want to make sure that I have done everything right that my company can be up and running in a month. Is there a good check list anywhere?

I have already:

-Registered the company as I/S, have CVR.

-Registered as importer

-Got welcome letter from Skat! hah..

What is there to remember? I don't want to get in trouble later, so I would love to do everything right. 

Thank you in advance for all the advices! You can answer me back in English or Danish, what ever is easier for you. I also speak Finnish and Swedish, so feel free to write me back on those languages too ;)