Bot teams are in auto mode. The tactics do not change but the starting line-up do on occasion when there is injury/suspensions. I would just keep a close eye on bot teams as some may spring a surprise or two. Especially those that play 5 across the back or midfield. They tend to give newbies lots of trouble. In my Level 1 days, the bots were the ones who won the Cup & CL (some).

You should have no problems leveling up if you have a decent set of players and formation, regardless if you login everyday or not or even attend matches.

As for the unsymmetrical lineup, as long as it is not an illegal formation, there should not be a problem. If it fits the game logic, then the formation will work for you, if it doesn't then, your opponent will have a field day. You can read about illegal formation in another thread (i assume you have).

As for stadium development, I would not worry too much about building the stadium itself. Through trial and error, I find that building your medical centres and training centres should be your focus. There two give you free medic & health packs every 3-4 days. So once you maxed out the level upgrades, you can start with other constructions, then that is up to you.

Good luck & enjoy the game.

PS try not to buy tokens, just farm them