developing a mobile app

Hi Guys

we are planing to design a mobile app?
i need resources about this topic?
like
difference betwen a mobile app and a link to a web page in my mobile screen?
how hard is to customize a website to be mobile friendly?
How does the plattform affects the price?
if i need an app for iphone, apad, droid, windows mobile, etc? are these different prices or one package?
can i send text messages to users that are using my app?

Is there any tool to help create a mobile app?

If i decide to do just a link to my website as an icon, how can i distribute the icon, or users have to create it?

We have 2 phases for this mobile app
1.- We have a database online that we would like to be accesible by a mobile device?
So i need to cusomize my site to eb mobile friendly or create a new mobile site?

2.- I would like send them reminders by text, send them feeds, live support option, etc

what are my options

Where do i start

Please help

thanks
titorober23Asked:
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hjgodeConnect With a Mentor Commented:
If you want to target so different mobile devices with different OS you may start with a web based franework like the Jo Framework (CSS, XML, HTML) and possibly the PhoneGap runtimes to access the mobile resources.

Here is  list and comparison of mobile development tools, some of them are CorssPlatform frameworks: http://en.wikipedia.org/wiki/Mobile_application_development

Another comparison of cross platform development tools for mobile devices: http://devlup.com/mobile/cross-platform-mobile-development-tools/2416/

I recommend to start with a web based application, so the code runs on the server. RSS feeds are a web standard too. Sending Text Message can be done using a SMS gateway (not cost free).
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