Jumping straight into sketch is tempting and all the other steps look like a waste of time but I feel these steps are more like breaking down the product design into manageable modules that lead up to the final UI.
For user-flows you could try draw.io or whimsical.co (personal fav). For wireframes, maybe Balsamiq.
I really like using whimsical.co. It's a lot prettier than draw.io, and I think the connections are easier to mess with. That being said, you won't be able to export to SVG like you can with draw.io -- you can only do PNGs I believe (though you can have a transparent background, which is nice)
Not sure I have an answer for you in terms of your setup, but I just wanted to recommend Whimsical.co for stuff like this. I mapped my setup pretty thoroughly and found it super easy to use and keep things organized. I didn't go and add pictures, but you could do that too.
Thanks, I actually found them all on Google, but I was looking for the exact same tool/ kit he used, including the wireframes and stuff. I really like the design. Others, such as Overflow, doesn't provide wireframes.
Hey Nox, 2mal — Daniel here, founder of UX Tricks — thanks for sharing my RWD article.
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From my experience of designing mobile navigation, it’s been clear that not every case is the same, so some usability testing is in order. If you have a user base, there’s actually a sweet tool called Userlook which lets you conduct user tests with your existing users for free (you only pay if you want Userlook to find user testers for you), so swap a moment of their time in exchange for a freebie of some sort (to sweeten the deal).
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But that being said, there are a few tidbits of UX that all users respond to.
Hope this helps, feel free to reach out. Btw, I’m updating my book this week to include even more details about usability and more, you can find it using the UX Tricks link that Nox shared above. Good luck mate.
For an easier learning curve, you are going to have to sacrifice features. I've found two that work very nicely with this tradeoff:
https://whimsical.co (works REALLY well for flowcharts but also does wireframes)
https://marvelapp.com (awesome DEMO mode options)