If you're new at this I suggest that you get your technique down first with a 5/8 then branch out as to different brands and sizes. That technique is not only shaving but stropping. Once you are confident with that then experiment with size and brand. I have a hodge podge of razors in all sizes......new, vintage, heirloom, NOS, custom, restored. So my current favorites are---->
New--Boker 6/8.
Vintage--Geo. Wostenholm IXL Celebrated 7/8.
Heirloom--My Grandfather's Lakeside cutlery 6/8.
NOS--Jacob Wiss 5/8.
Custom--Koraat 8/8.
Restored--Isaac Diller 13/16 restored by Outback Mike.
I'm sure this list will change when the next razor comes my way.
If I do my part with stropping and shaving I get a comfortable, long lasting, 4 pass bbs that keeps the old widow women and divorcees happy. Welcome to the rabbit hole. It's deep and there is no light at the end of the tunnel. Look sharp and smell nice for the ladies.:)