Hey there, Welcome to OGF, I'd like to remind you of some short things:
1st: CALM...DOWN... we all do mistakes, no ones gonna rip your head off for doing mistakes.
2nd: CALM....DOWN... Yes we saw that deleted coastline or messed up border etc., no thats not a reason to panic or be ashamed or whatever. Also mind that OGF tends to take its time so checking the next morning should be early enough to proudly look at your mapping results.
3rd: CALM.......DOWN.... Everyone starts from the bottom, but before asking if we are ok with every little detail It'd be useful if you read through the help pages and wiki articles before. Maybe that'll help you decide, afterall if its not unrealistic its ,your' country (if you claimed your own already) and you can do whatever you have planned.
Have Fun and Happy Mapping :)
(If this also doesnt help make sure to bother the admins with your questions hehe)