Bathroom remodel drain and vent questions

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New jersey
Hello all I am currently remodeling a bathroom with a tub , toilet and a single sink. I want to add a sink to have a double sink vanity. Current setup is image 1 proposed update image 2 .
Questions: does the bath need its own vent prior to the "wet" lav vent
If so can I use a horizontal vent tee prior to the tub p trap or do I need to use a tee wye? And can it be on a 45 instead of 90 then run horizontal to the framing because my framing is about 6 inches from where tub drain line will be running.

Currently I have abs I plan to use abs to redo the drains how should I connect the abs tub trap to the new PVC tub drain and overflow? Glue or 1 1/2 fernco no hub fitting?

Thanks for the help


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