Weather Stripping 1979 Chevy G20 Cargo Van

I need some sources to obtain weather stripping for both front doors,( window seals for the roll-up windows for the same),weather stripping for the side slider door and two rear doors.

Whats the best way to remove the old glued- on weather stripping and best product to remove the old residual glue to prep it for the new?

What's the recommendation for weather stripping glue to use?

I've looked at the weather stripping(grooved) for the front two roll-up windows  but have not found any article how these are removed and their proper re-installation.I'm stumped as to what keeps them in place.

I would certainly welcome any  recommendations,points,references to tackle this.

Thank you