Over winter, start researching.
www.bonsai4me.com is a great resource, as is the Bonsaitalk wiki section.
With out wanting to sound like an [expletive deleted], reading up on as much as you can first before asking long strings of questions. It helps you understand the answers given. There are lots of online and offline reading available to beginners. From styling, to watering.
Having basic horticulture know how like you do will be a big help.
Your tree looks similar to a plum.
Welcome to the bonsai bug!