Soon as you get your tuning item of choice you can flash a Stage 1 map without any bolt-ons.
I myself run the Cobb AP that Synolimit so despises, but in the end, it is a personal choice.
Stage 1 by general definition is just an ECU flash and doesn't require anything else changed. Once you start changing out parts like intake (technically even drop in filters), turbo-back exhausts (down pipe), boost controllers, BOV, etc. you need to have a pro-tune.
Like other posts have shown, there are online tuners out there that will make a map for you based on your car and mods attached. Stage 1 maps are normally OTS (off the shelf) type ordeals since most these cars are the same mechanically. A custom tune for your particular car will always be more ideal, but that requires a tuner doing either a dyno tune (more $$) or at least a road tune.
Hope this helps-