Electronics protyping and manufacture
The general process that you should follow is:


Design concept
schematics and research into alternative solutions to your first adventurous guess
breadboard each circuit as a 'module' and make sure its all good. Select appropriate components for the required ratings, voltages, and operation conditions. find Bill of Materials by looking at supplier websites such as element14, RS-Online, Digikey (my favourite) and Mouser as a good start.
once the electronics 'modules' are proven to work, get onto the software prototyping and how it interacts with the electronics, to prove THAT part works
use some free CAD package like Eagle or DesignSpark (closer to Altium in operation) to do the schematics and component
once the PCB (probably 2-sided, unless its very complicated) has been done, and all the traces routed and the design rules specified BEFORE YOU START routing, and then do a Design Rule Check to ensure no weird net issues, contact a PCB manufacturer. I use PCBCart. Get a quote, send them the design file OR a Gerber output (they will help you make one, or look online for tutorial) and pay them lots of money. 
now go and buy all your components, 
you will receive your board, solder stuff on, and mostly likely there will be something wrong if it's your first time - but that is okay! Debugging circuits is fun, and a very good learning experience. As you progress, your boards will have less errors.


good luck!