Since you have most of your blocks done it would be a good idea to measure what your seams are on the blocks you have done. Then by moving the needle and/or where you line up your fabric attempt to get that same distance with your new machine. This will help to maintain the same size blocks as those you already created.
After you finish this quilt you'll be able to use the 1/4 foot to maintain a set seam allowance on your future quilts. When following patterns it's good to use the same allowance they did for pretty points on stars ect. fabicluvr explained the different types of 1/4" presser feet perfectly.
Buying extra feed and bobbins as you learn more is very simple, you will just need to know what type of shank your sewing machine has. In the case of my Elna it can take both snap on feet and low shank feet, and I think the Kenmores currently avail. are the same.
Happy Shopping!