Here are simple, respectful wordings you can use to tell others to start their bhajan now, without giving any instructions on how to conduct it. You can mix and match or tailor them to your tone.

Formal (polite/official)

• "Kripalu bhajans ke liye abhi shuru kariye; sabhi ko apni bhav-samarpan ki pratipaadan ki aavaaz sunai degi."
• "Aaiye, aaj hi bhajan ki arambh karein; sab mil kar shraddha bhari aawaz se aradhana shuru karen."
• "Krishna/Keval Darsan ki bhakti mein, aaj hi bhajan ki ghanti bajti hai; sabhi se nivedan hai ki turant shuru karein."

Casual / friendly

• "Chalo, abhi abhi bhajan shuru kar lete hain."
• "Aaj bhajan ki ghanti baj rahi hai—chalein, turant shuru karte hain."
• "Bas abhi se bhajan shuru; hum sab mil kar sur ke saath aradhana karte hain."

Short, concise

• "Abhi bhajan shuru; sab mil kar geet gaayen."
• "Aaj hi bhajan ki shuruat; aawaz milakar bhakti karein."
• "Bhajan abhi se; sabhi taiyar hain to sur milayein."

Respectful exhortation (humble, devotional)

• "Prabhu ki kripa se aaj hi bhajan ki arambh karein; sabhi ko apni bhavana vyakt karne ka avsar milega."
• "Saath mil kar bhakti ki is jut ko aaj hi jagayein; bhajan ki pratiksha mein sabhi taiyar hain?"

If you’d like, tell me the language (Hindi, Gujarati, Marathi, etc.) or the specific tradition (Digambar/Shwetambar) and I can tailor these to fit more precisely.