Actually reading the manual and watching Bubbles already is a good start :) .
The issue with drafting is that it will likely be a bit late in the season to get enough draft points to find enough minimum 4 balls skills AND potential players to make it worth spending the money.
To even get 20 draft points in 4 weeks before season end would cost $120000 for instance. 20 draft points is the minimum to really be worth spending and not rolling over into next season (which you can do, the draft and scouting page tells you this).
This would be 10 points for a combine so you know which draftees are 18 or 19, what height they are, and get hints on where their better skills are (from given position), and 10 more on getting a group demonstration from the 1 and 2 ball rated players. Your scouts are FAR from perfect and it would be surprising if at least a couple of those 1 and 2 gray ball rated players aren't really 4 or 5 ball rated.
Less than 4 balls in draft rating and the TSP of the player is likely too low to be worth the training minutes you will have to give them every week in games, less than 4 balls potential soft-caps them at career peak to a low enough TSP that it would likely not be worth you long-term concentrating on a single player or two just to end up with a player/players that might not even sniff at at a national cap. For example, if you look at the Romania national team EVERY player is hall of fame potential, and 5 ball potential usually means they are at least MVP potential.
There will also be a glut of 18 or 19 year old players available in the season break after the drafts. Players not good enough for a RBBA or other top level league team to invest minutes in might still be plenty good enough for you and available for reasonable fees.
A bonus of drafting is that the players you draft will all be Romanian too if that is important to you.
A big disadvantage in your case is that you are likely to have a low draft position as you currently have the =4th best record in the division so would be picking 12th or 13th. In short even if you scouted good players for the draft then there is no guarantee a bot team won't pick them before you can!
If you buy now, I'd see if you can get 2 or 3 MVP or better potential 18 years old players with enough TSP to start for your team for less than what the draft points will cost you. The ones worth having aren't likely to be Romanian though.
You might consider a 19 year old if their TSP is significantly higher (like 8 or 10 points more) and/or they have super-high potential (hall of famer or all-time great) not available on the transfer list (or not at the right price anyway!) at 18. The advantage of doing this by transfer market rather than draft is the skills have been revealed and you can decide if sheer ability or potential or both of a player outranks the extra year older those players are.
Training is maybe THE key part of Buzzerbeater.
Some basic training tips without giving everything away include:-
The shorter a player, the quicker they train guard skills and the slower they train forward skills. The taller a player the opposite applies.
Every year older a player is they lose a few % in how quick they improve through training.
One position training trains less players for a higher improvement in what is being trained for those few players, two positions more players for a smaller improvement each, and so on to team where everybody who gets minutes gets trained but the improvement is pretty small for each individual player.
Make sure any player you care about especially those you are specifically training get enough game minutes like the training page in the manual tells you!
A youth coach gives training a boost but ONLY to 18 & 19 year old players.
Hope this helps and don't forget to invest in the arena!