I would like to give some helps on the ARM side, I have read some posts (too much, probably i am a bit lost), now time to jump in the water.
Other questions will come with time, first I would like to find a starter kit for developer
rasbperry3+ (following the goal we aim)
power supply (>3A ?)
some sdcards (8GB ?, which speed category ?)
does a fan is needed ?
a matchbox or a box