It seems that 23 is a lot of pages when you are starting but its not really all that many, it would be fine to publish them all at once, especially if some of them are admin pages.

Just publish it already. I publish sites as I build them.

Huh? Do you mean you use it as an index? This makes no sense to me.

Just my opinion/preference so others may of course differ:

1) I'd go for say five pages to start with and add the other pages on a trickle feed around three or four days apart. And do a spot of social bookmarking for each page once it's published.

2) That would help with site navigation I'd imagine. Whether or not there are any ranking issues - who could honestly say as there's far more to ranking that that.

Suggest exploring/ciltivating other traffic sources rather than pinning your hopes on chasing rankings from fickle search engines.

If you have a legitimate site, you would stop worrying about this stuff...Heck, G wouldn't give shit if you publish 100 or 1000 in a day, or do they?

IMO, Garbage in, Garbage out...

1-If me I will post an article every 5 or 7 days because the site is new
2- it's ok

Stagger them and publish them, this way G will read it as fresh content being added at regular intervals.
All the best. Regards.

I like to drop articles slowly, in similar fashion others have suggested. I also like to have different dates on all articles, maybe even put couple of them in the past just to spread the publish times around a bit. But that's just a personal preference, and it really shouldn't make much of a difference. New site is a new site, and Google sees a metric crap ton of them published every hour.

1. Live all of websites in a single day. There will be no problem. Create site map and add it to webmaster tool.
2. Try to add valuable content on home page.