Well you should store it in a database, most probably an SQL based database. MySQL is a fine start, free and easy to set up. But, you had best start thinking about security issues, especially if you are planning on storing credit card and other personal information. Hackers go right through the ...
I admire your ambition but I really do need to caution you against learning to code as a means of building out your app. If you want to do this as a fun hobby to teach yourself to code, then by all means do it but if you seriously want to build and launch an app that you think has a potential co...
https://www.filepicker.io/ is the best thing that you can integrate with this app which suits your requirement. If you are the owner of the app, you can integrate it very quickly. If not, you can suggest the app owner to do it Feel free to call me if you need more clarification. I am consulting...
You should try Balsamiq for this. After this you might consider InVision for displaying working and designed solutions
You can do this by using a server backend such as Parse. They have a free SDK. There are other similar options and I believe apple is rolling out the same thing in iOS 8 with CloudKit.
Ries owns 'Lean Startup' trademark. I doubt 'lean' by itself is trademark-able, and isn't claimed by Eric. Someone else may claim 'lean career development,' so might be worth a trademark search.
I've heard of people having some success with https://www.cofounderslab.com/ but overall you just have to get serious about networking at technical Meetups, etc. It really depends on your geographic location. In some cities this is easier than in others. I have cofounders in different states, so ...