I've never taken this "slotted" approach, but going into my 11th season in a salary cap league, I would recommend you start by figuring out your projections in excel (or use someone else's if you prefer) for the upcoming season, work out your VBD numbers, and then assign $ values based on their VBD. This has been extremely successful for me in the past.
It's really not difficult: make and educated guess at how many players will be drafted, give them all $1 to start with. Multiply your salary cap by # of teams and subtract the $1 per player from this total $.
For example, a 10 team league with 20 man rosters would draft 200 players. If they have $100 salary caps, you have:
10x$100 = $1000
$1000-$200 = $800
You now know that all teams have $800 remaining to pay players in excess of the $1 minimum.
Now you just need to add up the total number of VBD points by all draftable players, then divide the total remaining cap space by the total number of VBD points. This gives you the value of each point of VBD, leaguewide.
You then simply multiply that value by the number of VBD each player scores. Now add the result to $1, and you've got a unique price for each player based on their actual VBD. When you add up all salaries, it should equal exactly your total leaguewide salary cap - if it doesn't, you've done something wrong. Again, it's really easy to do this all in excel.
You can also make adjustments to this formula based on whether you want to overpay for starters, etc. But I won't go into all of that here. Hope this helps!
You can adjust your