You won't rebuild through the draft alone. Here's a theory of winning I wrote last month:
1. Rookies are a future investmentA rookie player will usually have full position experience in their first season. They will however almost certainly be some way short of their future potential. A quarterback with 75/100 passing accuracy is a liability, even if they end up as a hall of fame candidate by the end of their career. Analysis indicates that it takes until a player's 5th season before their current rating matches their future rating (unless they're losing value). This process can be lengthened further if players are moved to a new position.
2. Learning your playbookMaximising play experience as an individual player takes many times running that play. Each player has some play knowledge coming into your team even as a rookie, but it will take them several seasons where they get ball-time before they learn the ins and outs of your scheme. If it's not already obvious, this means that there is also a penalty to your progress if you change your style of play mid-way through the careers of your players.
3. Taking aim at 4 seasons from nowWhile you're obviously going to try and win as much as possible every year, equally you want to get a feel for when your team is going to hit the sweet spot between years 4 and 8 - the point at which the majority of your players are at their peak. During that window you want to be losing as few players to retirement as possible while making trades that bring in players who already have experience, and are at the same kind of peak as your core team. A mishmash of rookies and vets will lead to a middling record where you're unlikely to perform brilliantly or terribly.
4. Deciding when your campaign beginsRight now, almost every team has a mishmash of players of various ages. That's fine and good and normal. One of the risks of a "targeted season" is that not only will you land a strong team all at once, but that team will become obsolete all at once leading you to require a total rebuild as the franchise ages.
If you jealously covet every one of your draft picks, allowing for bust players you'll easily renew your roster as it retires especially if you dabble in free agency and waivers. You will have difficulty hitting the sweet spot in experience for the majority of your starters however, as you'll have players in every segment of age range. It's not impossible to do well in this scenario, but you're making it needlessly difficult.
If you're opting to aim for a target window of success build it around one or two key players. If they're young (rookie to age 3) trade picks galore to get more young players and to bring as many draft picks your way as possible as quickly as possible. You want these guys in the ideal experience zone all at once so you can then trade more to fill in any gaps in your roster. With your player acquisition strategy in place decide on your gameplan... and stick to it! You want 20-30 offensive and 10-20 defensive plays that your team are near 100% familiar with by the time they're in their 4th or 5th season. You'll know when you're there, because you'll start winning a lot.
When you're first learning gameplans, particularly with rookies, expect turnovers galore. Expect games with really low offensive output or atrocious 3rd down performance. This is fine. In order to win you first have to lose a bunch. Your rookie quarterback may be a total liability but he needs to learn the playbook and won't do that on the bench.
But what if you want to win right now...
5. The other option
Between the free agency market (at the right times of the season) and a massive amount of trading it is more than possible to put together a winning team from nothing but veteran players. If you retain a few draft picks and one of them turns out to be a superstar you'll find there are a lot of teams who'll pay over the odds for their services. Trading a cornerback who looks certain to be a superstar in 4 seasons for 3 80+ rated, starter calibre players is very very doable. If you're prepare to take on players on the virge of retirement as well, you can snap up some amazing talent at well under market rate. The problems you'll encounter are solved with time investment - orchestrate deals all over the place, focus in on teams whose playbook is similar to the one you want to use. You'll need to be very careful with your salary cap (although trading removes any liability for bonuses) and you'll be renewing your team regularly.
The easiest trading targets are teams with a mixed age range of players who look like they might be rebuilding. They'll jump at the chance for more draft picks or future stars in exchange for players in their final 3 seasons.
6. The golden rule
As always, trade. Teams who don't trade won't win. Teams who don't instigate trades to better their own team are less likely to do well, because it is one of their opponents who is actively pursuing a winning team.