Hi Brennan,
Welcome to the forum, firstly you will probably get a post from the moderators on for your subject, (I have before too) being that it is too general, anyone searching the forums may not come across your post as it is non specific,
Secondly, I recommend you read the "If your new to FPSC, start here" thread in Product chat, also the community giude is a great source of info:
http://forum.thegamecreators.com/?m=forum_view&t=131868&b=21
To answer your first question, you need to lay your starter marker, then right click to view the propertioes, in there you can alter the start state of your player, including health, ammo, weapons etc.
For video tutorials visit:
http://www.fpscreator.com/video_tutorials.html
Your second question then seems to be a similar issue, you can right click on the entity (enemy in this case) you place to adjust the starting health. You need to set up the respawn to the ammount of respawns you want, again the in the properties section of the starter marker for your player.
Not too sure about the selecting which player you want to be, maybe someone else can help on this one??
Hope this helps and good luck!!
PS: Are you releasing your beta here on the forum?
Far too new to be helping...