1. Split it between you guys, and handle investors later. When a new shareholder (investor or employee) comes in, all existing shareholders dilute equally.
2. Yes. 4-year vesting with a 1-year cliff is typical. Sometimes single- or double-trigger acceleration.
3. 60/25/15 seems really unbalanced. Is the product built and launched yet? Do you have users? If you haven't launched yet, I'd do 33/33/33 or close to it, since most of the work is ahead of you. If the other guys have raised money beyond techstars, launched, or gotten traction, then you can do a less even split. In general, just having the idea isn't worth anything on its own. The hard work is to build the product and get people to use it.
2. Yes. 4-year vesting with a 1-year cliff is typical. Sometimes single- or double-trigger acceleration.
3. 60/25/15 seems really unbalanced. Is the product built and launched yet? Do you have users? If you haven't launched yet, I'd do 33/33/33 or close to it, since most of the work is ahead of you. If the other guys have raised money beyond techstars, launched, or gotten traction, then you can do a less even split. In general, just having the idea isn't worth anything on its own. The hard work is to build the product and get people to use it.