As Belbuc's Coach said, it depends on what you want out of the game. There are many ways to play this game, and there is not just 1 right way to get better. I can imagine you don't know yet what part you'll like the most, so if I were you I'd at least take this opportunity to find out what training is about. As said, the start can be hard because your trainee will be a weak spot on your roster when you play him, but as he gets better, the joy of using him in games becomes bigger. You've got nothing to lose now, since you had a bad start in losses.
A couple of things you can try right away:
1. Expanding your arena. The quicker you can get it to grow, the quicker your income will grow and with that your possibilities in the game. Everything costs money, so if you have more you can do more. Spending half the money you're getting on your arena is not a bad idea, although you can prioritize a bit differently of course
2. Look for some vetrans on the transfer list to help win you some games. Since you'll be training guards, you can get some veteran forwards and centers. You don't have to buy them right away, just spend your money wisely. Take a look at what players are selling at what price for a while, and see if you can get one at a good price. Balanced players are almost always better than players with just 2/3 good skills, as they'll have a higher salary for what you're getting. Keep in mind that players of 33 years and older will get drops in their skills, and their market value goes down quickly with that. It's OK to buy old players, but make sure you don't spend too much money on them.
3. Get an advanced trainer with a salary of under 15k a week to train your MVP trainee. You don't have to spend a lot of money for one that gets 12k salary, just make sure it's under 15. Some people might advice getting a better trainer to make sure your trainee gets the best training, but that costs a lot more money that you don't really have when you just start.
Good luck, and if you have more questions just ask here or you can send me a BB-mail!