Two Simple Photoshop questions for Poster

Dear all,
two simple questions for Photoshop.

I am making a banner and I want

a. to design a line around the borders so to have sort of frame. Some guides on doing that or how to draw stylistic lines in photoshop would help

b. MAke a logo that also scales very well on large sizes (raster graphics?) I want also to use photoshop for that. Any guides for that?

I would like to thank you in advance for your help

Regards
Alex

a: under layers you have that little 'fx' button and there you'll find 'stroke'
b: you want vector graphic. you can scale those as muchh as you want without degradation. but that's ilustrator not photoshop

try FX button and find your stroke.

b. Decide on the largest size you expect your graphic to ever scale to and design it from the beginning at that size. But Illustrator is better if you are not using raster graphics.

You need:
1. fx button &
2. vector graphic