問題ありません。つみたてNISA口座は単独で開設可能です。特定口座は通常の投資取引に必要なため、後から必要になった際に開設できます。
本人確認書類（運転免許証やパスポートなど）とマイナンバーカード（または通知カード＋身分証明書）が必要です。スマホで写真撮影してアップロードできます。
通常、申込から審査完了まで2-3営業日かかります。審査通過後、入金すればすぐにつみたてNISAでの投資を始められます。
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