On the losing note, along with the basic ideas of looking at losses as learning opportunities, stomping computers occasionally, etc., I found two things that really helped me.
1) Playing a training league team that was one of the ones that you expect to loose like halflings or ogres. In my case I chose ogres, and the team was unlucky enough that I actually ended up totally remaking the team in the middle of the season.
The fun then lies in being able to laugh at how horribly screwed your team is despite their many losses, while also getting to laugh when you do pull off some crazy big play and manage to score one of the rare touchdowns. (And since the team isn't too important you don't have to worry too much about the players being killed or hurt).
2) Switching from the main type of team you are used to playing. Normally play bashy teams? Try out a wood elf one. Normally run agility teams? Give the dwarves a try. Sometimes it's nice to just swap playstyles, and who knows, you might be able to win some games in the new style (I know I certainly have with this latest wood elf team).
And if you're still having trouble winning I'd suggest checking out some of the many articles on bbtactics. I know it sounds silly, but I know that simply reading some of their articles on cage basics, the 6 move one-turn touchdown, and the "How to Beat Elves/Dwarves" articles have certainly helped me out a ton. (The how to beat Elves/Dwarves articles especially helped me, since they apply more broadly on how to beat [or play] a bashy/agility team in general). Additionally if you ever seem like you keep running into a specific problem over and over you can always feel free to post here about it. I know that I've gotten some advice before that was quite helpful to my overall strategy here.
That said the most important thing is mostly to just stick with it as much as you can. We were all beginners or novices at one point (except Kanil, who's we all know has been a pro forever
) and we know how you are feeling.
And Re: Undead team being pointless, if that's the case and you're going to drop them after the season anyways then I'd suggest playing them like they were going to lose anyways and you don't really care about them. Take a few more of those high payoff single die blocks at the end of your turns, throw out a few more fouls on downed players, go for that dodge+blitz. The worst that can happen is that you fail and lose anyways, and the best that can happen is you end up taking enough enemies off the field that you win. (Not to say play totally suicidally, but I find there's usually at least 1-2 plays every turn that you normally wouldn't do since they only have a 50% or less chance of success that you can take. If they fail you're screwed, but you were screwed anyways, so things can only go up from there!).