Looking for an online Montessori "course" to use when HS'ing my 4 y.o.?

[zebaby]

We have decided to HS my 4 y.o. DS. Although I will take an eclectic approach to HS'ing, I want to have a heavy lean toward Montessori. I am looking for an online "course" to learn how to teach Montessori. I don't care about getting certification. I just would like some useful direction in how to properly implement lessons as well as to gain an understanding of the scope and sequence in Montessori. Most importantly, I need it to be affordable!

Again, I am only going to be using at home with my son. I can probably get along on my own with downloading free geography, science, practical life, etc. but I have a bare bones understanding of Mont. Language (I have found some great resources that have allowed me to do fairly well with it so far) but am not familiar with Montessori Math at all.

I ran across Karen Tyler's program as well as Lisa Nolan's materials. Does anyone have any opinions about either of them (their materials for the price)? Are there any other programs I should check out? Any suggestions or even any Montessori homeschooling advice is welcome! 

Thanks!

[sapphire_chan]

http://www.infomontessori.com/mathematics/introduction.htm walks through the different stages of works, order of presentation, etc.

[zebaby]

Thanks! That was a very useful website. I had bookmarked it before, but I guess never took a close enough look to see the wealth of information it provided. I will definitely use this to help me plan! :thumb