There is also GI Management tools that can help you better review how your players will fare in each position. You can download this to your computer and then once you input your name and password, you can download your player roster to that and begin reviewing your positions. You need to know that "natural" position is completely random to begin with and also for any new youth player you pick up. It's up to each manager to determine what the "best" position is for each player based on all their skills.

I would suggest the following in order of priority when you first arrive:

Get a sponsor, build vip seats, schedule friendlies each week at venues with 9-14k seats, download GIM, download greasemonkey and then all the scripts that go with it, review your players on GIM to determine each players desired (or best) position so you can begin playing them in that position, set preliminary starting line up and save it, hire a fitness coach, set training to "average, for all players, set training to "fitness" and "all skills" for all players, read the forums (most especially center for rookies) everyday, get match day sponsors after every match. Repeat building vip seats and then execs until they are full. Once you get good revenue coming in, you should be familiar enough with the game to determine where you go from there

And dont forget to pick youth player every week