Spike, I am not saying you shouldn't be "curious" about beating/gaining an edge over the casino. We are all hear for this reason.
You are looking for an edge in the wrong way. Picking random numbers and/or varying your bets will not make you a winning player. As Elliot Jacobson likes to say, "You need INFORMATION". This is information that can swing the edge from them to you. Everyone discovers their interest in beating the casino at a different age. For me, it was in 7th grade, I was 13 years old. Just like you, I ordered a Roulette table to "practice" (lol) on. I independently (like many) discovered the Martingale and thought I was onto something. The difference, I realized within a few months that these are not winning systems, and this was before forums were common. I learned this by reading books. You Sir, have very smart gambling people that will tell you exactly why your methods do not work. You can choose to listen or keep chasing your tail (I hear you do like cats).
Your route was a little different. You have become quite possibly, the most prolific forum poster in gambling forum history. Some learn at 13 years old, while others are still searching/"practicing" (lol) at 75 years old.