Cut up all your credit cards and take your name off of your checking account.
If you don't all your extra money will be spent on knifemaking tools and supplies.
Just kidding, welcome to the addiction. As far as edge thickness you're gonna want to go as thin as possible when using hand tools only. I suggest .025"-.030" if you have access to calipers. If you don't then use a #70 drill bit which is .028" as a guideline. If you're using high alloy steel such as stainless or CPM you can go even thinner. Just dive in and have fun. You'll make plenty of mistakes, just learn from them and try not to make the same one twice. Each knife will be better than the last. Remember that no matter how bad they look 99% will still make a good usable tool. If you don't have access to heat treating I'll be glad to do your first one for free. This forum is a wealth of info., I'm pretty sure someone here will have an answer for just about any question you may have. Don't forget to show us some pics.:thumbup: