Yes. Make sure you only do one withdrawal a month.
Make sure your bank does not have incoming TT fees.

Agree with moosset - very specific question. Personally haven't tried it yet
Exchange rate wise - both are similar. Each has pros / cons

(1)
PROS: own named transfer into IBKR, so funds reflects almost immediately if transferred during working hours
CONS: need to pay $2 commission in IBKR to convert to your "intended" currency before buying stocks. Exchange rate is spot-rate though so no issues. Net loss typically is $2 (commissions).

(2)
PROS: can transfer directly in your intended currency (eg. EUR or USD), no need to pay $2 to convert within IBKR
CONS: paper trial shows funding source comes from Transferwise Ltd., IBKR may hold the fund and request proof of transfer / source of money. Some forummers took up to 7 days or even 10 working days ++++
For withdrawal, you'll definitely need SG account or some other foreign bank account or transferwise borderless under YOUR name. IBKR doesn't support withdrawal directly to MYR

Assuming you are MY tax resident:

For US, you should have signed the W-8BEN form (when you open your IB account). So 30% WHT is already automatically deducted by IBKR before the dividend is credited to your IB cash balance.

You don't need to declare any capital gains and dividend incomes (whether in the form of stocks or cash) to MY government.

Yup, it should look something like step 5 shown in the website (URL link) when you opened your IB account: https://investmentmoats.com/money/easy-step...e-brokers-ibkr/

Here is the screenshot capture from the webpage:

potatobanana have you bought stocks already? if USA stocks, just stock transfer out to that broker

if CSPX, u can actually transfer it back to FSMOne malaysia. someone on reddit did it, took 2 weeks