I have some quetions:
Should I buy any license to distribute my applications?
Which profit from the sale of applications?
(sorry, I dont speak english very well :P )
I have some quetions:
Should I buy any license to distribute my applications?
Which profit from the sale of applications?
(sorry, I dont speak english very well :P )
You don't necessarily need the Android market. You can just distribute your *.apk file by yourself (for free or against payment). This is one of the big advantage compared to Apple and the IPhone ;)
The profit you can make with your application depends on the price of your application and the number of sales.
You do not need to buy any license to publish in the market. You should read through the series of documents on publishing apps in the developer guide, starting here.
You can either publish your app as a paid app, in which case you could earn money directly from sales, or you could publish as a free app. With free apps, you can use ads as a source of income. There are a few providers, i.e. admob.
If you want to publish your application to the Android Market, you have to get a developer subscription ($25). Once you have a developer subscription, you can publish free apps as much as you like; in order to sell apps, however, you have to be in one of the countries where you can be a Google Checkout Merchant. Google gets 30% of the revenue. Also, be aware that the paid apps will be available only in countries that are listed in the Paid App Availability list.
P.S.: Both lists are considered too short by people like me, who live in countries that are not in them :-) Providing a free, ad-enabled version of your app is highly recommended if you want to increase your revenue.