Denine,
Welcome to the wacky, sometimes pull your hair out hard but always WONDERFUL world of home schooling!
I don't have any information about the publishers you asked about.
However, I have been home schooling my boys for the past five years (OH MY...have I really been at it that long

) and wanted to offer a few suggestions.
First of all for pre-K none of my boys really did anything much more than to listen to great stories (both modern kids books with pictures and sometimes very silly themes) and the classics (like the original Peter Pan and The Jungle Book among many others). Along with the books we also do a lot of math manipulative work. Not written math skills but learning the fundamentals through the use of counting bears, tangrams, shape sets, etc. When my kids are about 4 (and they show the interest) we start using Saxon K math. It's very easy and again, heavy in the "move three more bears into the line for the slide, now how many bears are waiting".
My youngest just turned 5 a few weeks ago so I plan to start him with K work next year. However, he is doing a few things this year. I do the above mentioned Saxon K with him (we have been doing it for about 3 months now) every other week day. We also let him join in on fun science experiments and I encourage him to listen in when we do history (although it is not required and he rarely does so). For the most part I just try and have lot of educational toys around for him to play with. Puzzles, art sets, board games, sewing with yarn cards, etc. I think that is all most 3/4 year olds need (there are exceptions and if your child is one of them, you more than anyone will know that).
As far as making time for reading with my youngest I have his "book basket" (it's just a small wicker basket **about the size of an Easter basket** that I got from
Walmart) and every night I fill it with three books and he picks an additional three books to add to the basket (when he wanted to read The Giving Tree every single day for two weeks we did). I usually pick books that are children's book classics, deal with a theme we are talking about (like dinosaurs or Easter) or are suggested reading for that age group. He is free to chose anything his little heart desires (I want to inspire a lifetime love of books). Each day we read every book in the basket. Some days it takes a bit more time...some days we zip right through. The rule in our home is that his basket has to be empty by the end of the day when it is time to pick the books for tomorrow. By using a basket, Dad can grab a book and read it to him, his older brother can read to him, and I can see just how much progress we are making each day.
As far as carving out time to work on long books with no pictures (we are currently reading the original Jungle Book) we established a special time in the day where all of the boys sit down, grab a snack and listen as I read. I usually read about 15-20 minutes each day. My youngest is allowed to have Legos or a sketch pad with him but he must be silent and he has to be able to tell me what is going on in the story if I ask him. Our family has come to cherish the time when we sit down together and read. We usually do it in either mid afternoon or mid morning.
I know it doesn't really help you on the curriculum end of things...but in my opinion (and again only you know what your child needs so I am speaking of my kids and others I know) at 3 and 1/2 the best curriculum is to start to spark their curiosity and work on a few of the fundamentals along the way if they show an interest with good books, some math manipulatives and a bunch of fun learning toys/games/projects.
Good luck...you will find the things that are just your teaching style and your child's learning style. If you are anything like me you won't find them on your first try or even your second...but in time everything will fall in place! GOOD LUCK!!
PS we really like the Sonlight readers and have many friends who are very pleased with that program.