A320 Packs off/APU Bleed take-off

[SMGianluca]

Hello everyone,
I'm new on the forum so if I'm not doing something in accordance with the rules, tell me.

My question:
First of all, how to do a take-off with packs off (A320)?
Is it right that you just turn off the packs before take-off and turn them one on one on when setting CLB Thrust (at accell height)? So turning on pack 1 and right after pack 1 is on turn on pack 2 or how should I do it?

Then second, how to do a take-off with packs on APU bleed?
I couldn't find anything where they say how to do it, saw someone posting something about the E145 where they turn off ENG Bleed, keep packs on, let apu bleed run and open the crossbleed valve? Is this the same for the A320?
Keep packs on, APU on, APU bleed on, then crossbleed valve OPEN and then ENG 1 & ENG 2 Bleed off until CLB Thrust (at acell height) and then put ENG Bleed 1 & 2 on, then crossbleed valve AUTO and APU bleed off and then APU off? Is this correct?

I would really appreciate any help and feedback!