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need help from an expert to concive one switching dual power pcb via webench

Hello! 

wanted to ask is there someone who can help me to design one power supply pcb:

i want to use an appropriate buck converter to transform incoming 14-24 DC and have dual output on +12V  and -12V  and also 5V (which will be via one regulator I imagine) so in fact will be triple output

all that with at least 900 mA or 1A or more at output (maybe less for 5V)

would like to be not bigger than 7cm X 4,5cm, with good efficiency and silent

if it  that is possible i will be grateful for your kind help since I'm not an engineer (so not understand everything on webench application) 

Thanks in advance!