They seem good, don't count on them being absolutely final though. They might be, but you should let yourself change them in the future if you get better ideas or useful feedback. Game development is a heavily iterative process, you should be aware that things will change over time and many things you won't get right the first time round.
If you're satisfied for now I'd say just use these for and actually start implementing them. You can always polish later.
If you're satisfied for now I'd say just use these for and actually start implementing them. You can always polish later.