Learning the Nashville number system will be of help to you. This way, you will understand some of the standard blues terminology like "quick four", "start on the five", "hold on the one until the vocals start", "meet me on the four", "two - five - one turnaround", "long one", "tag it to the five", etc. There is also quite a bit of slang out there for classic blues grooves like "downtown box shuffle", "uptown box shuffle", "flat tire shuffle", "12/8 slow blues", "thumper", etc. Then there are shorthand terms for classic blues chord patterns (that are not straight ahead twelve bar blues) like "sixteen bar blues", "eight bar blues", "church changes", "rhythm changes", etc. These terms are not necessarily universal, but I've found that a lot of experienced blues players know them and it's a quick way to latch onto a stick drawing of what you'll have to back them up with at blues jams or sub gigs. Also, buy this CD ...
https://www.amazon.com/Essential-Little-Walter/dp/B000002OBZ/ref=sr_1_6?crid=39A48LIN88MXE&keywords=little+walter+cd&qid=1565191935&s=music&sprefix=little+walter,aps,120&sr=1-6
... and familiarize yourself with the songs. If you seriously get into playing blues, there are a whole lotta harp players out there and Little Walter is ground zero for harp led blues and so many of the tunes on this disc are iconic and established blues standards that you're likely to run into.
Lastly, don't be afraid to play simply and be fully vested in a supporting role. Being reliable, a good hang, hitting the changes and staying in the pocket has enabled me to get much more work over the years than my "talent" should ever have warranted.