Get a piece of White cloth. None of that made-from-plastic junk. And, Thank the Goddess, you don't have to iron it, so make it cotton. Then cut it into a Seven inch square.

 Yes, seven. Numbers are important to magic.

No cheating!

 Get some Basil, Dill, and Fennel.

 There you go again. What do you mean, you don't have any Fennel?  Okay, okay, don't lose it. You can use a lot of Protective Herbs in this one.

The important thing is to choose Three herbs. Not two. Not four. It's the number thing again.

 Use any Three of these:

Basil, Dill, Fennel, St. John's Wort 

 Rosemary, Tarragon, Horehound, Vervain

Mix your herbs in an Earthenware bowl.

Hum a nice protection tune. Then again, you don't have to hum, but, hey, why not?

Gently mix your herbs up. You did grab only a little bit of each of Three didn't you? You only need a tad.

You are using a bowl that isn't that icky plastic stuff or creepy aluminum, aren't you?

Lay your cloth on the Altar. Put your herbs all mixed nicely, in the center of the cloth. Take the four corners, pull them up to a nifty peak. Your cloth is now a pouch.

Now comes the witchy part, where we tie it up with a, 
Red yarn, cut to Seven Inches.

Tie the First knot and Say in a powerful voice,

"I bind thee to protect this house and all within it!"

Tie the second knot and Say the same thing,

Tie Thirteen whole knots in your yarn repeating the command every time. Pick up your Athame in your prominent hand 
and grab the sachet with your other hand.

Now face North and hold the sachet in front and above you and poke it, gently, of course, with your athame.

Say as profoundly certain as you can;

"May this which I have made of my will and with my hands serve me well as protector of this house and all who reside within its walls. Guardian and Protector, so shall it be from this moment forth!"

So mote it be!

Now go hang your protector/guardian/sachet/cotton cloth bag  in the highest part of the house. Use the Red yarn to attach it to something.