Hi Brooksy,
If you go onto the offsite forum you can compare your own players to those of the players on the national team to get a fair idea.
Due to the team always turning over players the requirements can change every season. But as a basis I would follow these guides:
PG: Total of 66 over top six skills with emphasis on OD, Passing, Handling.
SG: Total of 66 over top six skills with emphasis on OD, JS, JR, DR and Handling
SF: Both OD and ID total of 20+ then well rounded out.
PF: Well rounded out with total of 44 for the 4 big man skills and 9+ for JS.
C: Total of 50+ for big man skills plus well rounded out.
This is only a guideline and will often change in the future due to the variety of players coming through each draft class.
I also have the auto message thing on for players that fit a salary requirement, but this tool is very limited as it only goes by players salaries and not overall skill levels.
Hope this answers your question and ask more if your still unsure.
Thanks