Don't worry about not having any bubbles in the airlock. If a seal leaks, you may not see any bubbles. 1.008 in 2 days is pretty quick. Pity you didn't take an OG sample (Original Gravity). Leave at least 2 weeks before bottling; not only does it allow fermentation to finish, but it also allows the yeast to clean up some off flavors.
Lets talk process. You had 8 lbs of grain in 6 US gallons. 8 lbs can get you roughly 240 gravity points with ~ 80% mash efficiency, or as little as ~ 145 with a 50% mash efficiency. Lots of things affect efficiency, since you are new to this, you should expect to be somewhere in the middle of this, and not at the higher end. Assuming you are somewhere between these, your OG would be between 1.024 and 1.040. With a 1.008 FG, your alcohol content is somewhere between 2% and 4.2%. ...... Yes, it will be low alcohol. I think you can assume about 3%.
How to improve? Be candid and let us know exactly what you are doing so we can help with improving mash efficiency (this could save you a lot of money). Add more grain. Supplement your mash with some malt extract (called partial mash).