Following a successful whitelisting proposal, the network will immediately begin accepting TKN deposits. Once a pool has more than 10,000 BNT worth of tokens, the DAO multi-sig approves a transaction to add BNT liquidity to match the tokens, and trading can start after.
The bootstrapping process is to ensure enough trading liquidity into a pool so that there will be a healthy amount of tokens for trades.
If you require more information or help regarding the entire process, feel free to reach out to Tiago at tiago@bancor.network to discuss collaboration. Technical documentation can be viewed here.