Wish I could have found out about the spring and electric scissors before cutting 10 pairs of jeans on my denim quilt. My hands were SORE!
My suggestions:
*I'd use a heavy duty needle since you're going to be working with thicker fabric. You might not really need it (I'm not sure since I'm not an expert at the durability of needles on certain fabrics), but I'd use it just to be safe so you don't have to worry about your needle breaking in the middle of a seam trying to stitch through two layers of denim. If you own a Singer it'd be a Style 2020 Size 80/118 needle.
*If you plan on getting denim thread, remember to get several spools of it since there's only 164m of it instead of the usual 274m. It goes by real fast! I'd at least get one spool for your machine and another just for bobbin winding. I got the denim thread because the regular "all-purpose" thread looked too thin to be able to hold two thick layers of denim together without breaking.