help needed.. appinventor noob

i need to make a basic computer booking service in ai2, however i am new therefore i have no idea what to do. 

it does not have any external database connection. just to work in the app.

when you click on a computer image on a basic image map (not google maps) you can book computers (10 available for example it will display once you press image), i dont need any feedback to anything external.. just numbers going down when i click reserve.. thats all

then i need two buttons, reserve and cancel. once i  have reserved a computer the number will drop. )  

i live in a area where there is limited internet, can you please help. thanks in advance

also i want to put a logo when loading the app, so it takes me to the main screen for booking. this logo will be small and will wait for 3 seconds then opens the app.. 

What you want is possible.   It will take several steps.  The first is to read the AI2 free online eBook   http://appinventor.mit.edu/explore/ai2/tutorials.html   ... the links are at the bottom of the Web page.   It will help teach you to program.  Along with this, do several of the MIT tutorials (beginner or intermediate level) at  http://appinventor.mit.edu/explore/ai2/tutorials.html 

Second step:   Learn all you can about TinyDB   or the File control + csv files,    these two tools are the only storage options you have in an area with limited Internet.  You may need to also work with Lists.   Although your app could be developed without using Lists, you might find them useful was you learn what they can do.

Lists

Sajal    http://www.imagnity.com/tutorials/app-inventor/list-blocks-on-app-inventor/

List of Lists

Taifun example     https://groups.google.com/forum/#!msg/mitappinventortest/rRuzOX63qiQ/v8S4lhplsTcJ

TinyDB

ABG's example    https://docs.google.com/document/d/12t4HLNRepCnbmcfycdF8wSHWht_D1P8hKJpTknVDChY/edit   demonstrates filtering

Stephen's example    https://sites.google.com/site/stevozip/home/AI2/tinydb

Step 3:  Learn to use the PhoneCall and Texting components...these are the tool you wil use to make phone calls and/or send a text sms.

Step4  Try some blocks and see what you can come up with on your device or emulator.   Be aware the phone components will not work on the emulator but you can code them there...they just won't make phone calls or send a text.