Oh, man. 13g of bali or thai kratom would make me vomit and dry heave for hours, get the hiccups, and generally feel like complete crap. I wouldn't advise it. I recommend going to erowid's website and reading everything that they have on kratom:
http://www.erowid.org/plants/kratom/kratom.shtml
After you read that, come back here and read what people have to say about kratom once you already have a general idea about it.
Try to take kratom on an empty stomach. This means that you want to wait 2 to 3 hours after having your last meal. Don't take it while you are starving though. A totally empty stomach on starvation mode makes people feel shitty, and adding kratom to the mix won't help that. So figure out what works best for you in that 2 to 3 hour window. It's cool to have an apple or some fruit 30 minutes to one hour after taking the kratom on an empty stomach. I find that, after I take kratom on an empty stomach, having a little fruity snack helps rev up my metabolism and kickstarts the kratom. Taking kratom on an empty stomach makes it kick in faster. You may need to wait a while longer for it to kick in if you gel cap it because all of the gel caps need to dissolve. I never tried it in tea. I usually just weigh out my dose, put it onto waxed paper, and "toss 'n wash" it, which means I take a bit of orange or apple juice to mask the bitter taste and put it into my mouth, cup my tongue, funnel the kratom powder into my mouth, then swallow it with more juice. After 30 minutes to an hour I start to feel it.
Too much kratom will make you super sick and that's no fun at all. Start out with a low dose after you've read up on it. Definitely read through the experience reports on erowid.org to get a general idea of what different doses do to most people. If you don't get a good effect, wait a few days then the next time you try it up your dose a bit. If it still doesn't work, be patient, wait a few days so you don't get a big tolerance and then try again with a slightly higher dose. Seriously, take it slow, kratom sickness SUCKS!
Tip: Kratom constricts your pupils like most opiates will do. If you want to check in to see if it might be starting to work, and you look in the mirror and your pupils are pinned, then you know it's doing something at least.