Hey, welcome to the forum. Do plenty of searching on here and google, and ask any questions if you do not fully understand something.
Building a kart can be great fun, but can be a little difficult if you have no previous experience and little tools. Please keep the option of buying either a kit or a used kart from eBay or craigslist and fixing it up. Buying and fixing a used kart can end up being cheaper and easier, but not always as rewarding.