Hello guys let me tell you my story ... i have one of domain which is in search engine but there is little thing , my site have been offline a while so if i going to work with it again will this cause some kind search engine issues like my new posts will not indexed to google? i will be happy to get some answers to it , if my english is bit confusing then sorry im from estonia.
I had a money site get hacked about a year back and google kicked it out the index. I restored it from a backup and had google recrawl it after the hack and around two weeks later it had fully recovered rank and traffic wise.
I guess, you can add your website to google webmasters tool and fetch the new post URL and then check is google site: your site it will help you to find the issues.
It does not matter if your domain is 10 years old, if it has been inactive, then your site will start over as new, and ranking depends on following google guidelines; If your domain is old enough, then you may not have to go through google sandbox, may index faster, rank faster, etc... why would your new posts not index? just follow google guidelines... google is the law of the internet....
Do Good work - On page and off page - Follow all the search engine rules - there are more than 200 rules - New posts are not instantly index by google, It depends on the Traffic to website.
Make sure your post a unique articles to your site so google automatically index it. Try to do social signals also for your new post.