Buying just the Kevlar will not protect your head. The Helmet protects you from headshot instant kills from most weapons. You will be able to absorb a few more shots.
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For freeze time select 5 seconds so you can have time to navigate the buy menu without having the bots come rushing at you. Check the option "Include CPU players." Select 3 bots (you can have more than 3 without changing a couple of advanced commands).Choose an easy map (de_dust2 or cs_office are best).In the main menu click "Create Server".To play against bots (Artificial Intelligence AKA computer controlled characters) create your own server. I recommend the first thing you do before you try to play regular servers is play against bots or Gun Game or Deathmatch servers. Instead of trying to hit someone a few times to kill them you will kill them instantly. Snipers, rifles, sub machine guns, and even pistols can headshot you. Don't run around thinking your are invincible. About 4-5 shots is all it takes to kill you in most cases. This is not your typical run and gun shooter.
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The first order of business is to learn the basics. Watch how your teammates work and look at all the typical hiding places for both teams. Stick in groups and you will survive longer. Do not Rambo style AKA "lone wolf." This means do not go out by yourself. Try spectating a few matches (or spectate others when you die and watch their tactics). You do not know the tactics or the weapon balances or anything. Hopefully you will outgrow your newbish ways and not become a noob. A "noob" is someone who is not new but still lacks skill, either because they never bothered to learn the game or are too stupid to learn. But you are willing to learn the game, better your skills, and to have fun. The first step to improving your game is to admit that you are a NEWB or NEWBIE. So you're new to Counter Strike Source and you want to improve your gameplay? Great.