So, I went to minecraftforfree.com and got this game for free, and i know i'm new, but i keep dying, i need weapons, i have a sword, but those skeletons with the arrows are killing me... More importantly, Im trying to make my house!
The Elder Scrolls foretold of their return... SO GET OUT A SWORD AND SLICE 'EM UP!!!
I'm not sure if this suggestion works for you. Perhaps by now, you've already solved your problem, but if you need more time to make a house than you can afford before the monsters come out, I might suggest making a very simple shelter you can hide out in during the night and come out of again when it's safe to work on your house. If you create a bed and use it during the night, my understanding is that as long as you are the only one in the game, the time will fast forward to day. One example of a simple shelter would be a shallow cave with a door, lit by torches.