First I want to thanks all people who replay to my question. So far I generated new seed with my custom words in offline Electrum wallet.  Now I need to split my pre-fork BTC to three addresses derived from that seed. To be completely honest  I am very scared to do it and mess up things. I have 3 scenarios and I am not sure which one to use.


1a.  Send some BTC to first new address and see if this works ok. But I don’t know if that a good idea since rest of my bitcoin will be send back to my current address ( apparently that things works in bitcoin utxo) and even it has replay  protection from forks am not sure that this is a good idea. Then send sequentially BTC to 2 aditional addresses 
1b. Send ALL my BTC to first address from my seed  ( check double, triple if address is right) and then after many confirmations split them sending to 2 additional addresses. Not the bet solution regarding anonymity and fees but probably most reliable.
1c.  I seen that Electrum support send to multiple addresses at once and even manage to make that kind of transaction in testnet ( without leaving any dust ) but I am not brave enough to do it with my money.
2. Regarding method of transaction I want to use Electrum offline wallet to sign transaction and online watch only wallet to broadcast it. ( I tested this in testnet and am think I can do it reliable)
3. As of transfer  forks can I do it later or even leave them as it is until I research things further. ?

Thanks in advance
 

Hello  fellow bitcoiners. I want  to  divide and sent my BTC to 2 new addresses but do not want lose my BCH and BSV during this process.
Can I safely send BTC to my new addresses ( they are 2 addresses derived from my new seed  ) and when old BTC address will be empty send all BCH to newly generated BCH address and then send all BSV to my new BSV address.
I want to use these programs to make transfers:

BTC: https://github.com/spesmilo/electrum https://electrum.org/
BCH: https://github.com/Electron-Cash/Electron-Cash https://electroncash.org/
BSV: https://github.com/electrumsv/electrumsv https://electrumsv.io/

Reason why i want to do BTC transfer first is because i trust electrum wallet and BTC obviously is most valuable. I am not sure if I can divide BTC and sent it  to  2 different addresses or  I must send all BTC to new address first and only then divide it and send to 2 addresses.

Thanks in advance