You pick the pair that you are most comfortable with. But most people prefer GBPUSD or EURUSD

best pair to trade on forex market

Get a demo account. Spend 3-6 months learning how to trade without losing money. And while you're at it, learn everything there is to learn about the forex trade.

A newbie in search of Support

I'd rather go for multiple time frames. It gives you more trading options.

Focusing on one or two pairs, one timeframe?

Look, you only place a trade when your trading edge is present on the charts. If your trading edge isnt present, you'd be risking blowing your account to bits.

Risk is not the same as probability