after this you make create new projects automatically: choose it when ctrl+n pressed and tick "Remember..." - next time it will be suggested by default.
can not say "that's all", but can say "that's enough"
there are a lot of other features in winasm+wafasm, on other hand this way could be shorter, but less convenient later. also, winasm studio has no syntaxis highlight or any other C-specific feature built-in, but anyway is more flexible then usual editor for programming.
finally i have to say - some tools have both automatic and interactive mode. keep an eye to not set commandline to run tool into interactive mode when output is redirected into winasm out window - this will hang studio! if you wish to use interactive mode - turn of redirection (see check-box below commandline in project properties box)