Double Bass I bought a bass! Not sure how to set it up better

IMG_3873.jpegIMG_3874.jpegIMG_3875.jpegIMG_3876.jpegIMG_3877.jpegIMG_3878.jpegIMG_3879.jpegHi! I bought a nice double bass from Facebook marketplace recently but there are some issues with it. Bridge is way too high up so strings are a little too high, tuners are cheap and don’t keep tune and also just feel bad, end pin will not come out but the hight without it works for pizz perfectly, and the tailpiece is a little uneven. So far I am in love with this bass but I am just wondering what yall would recommend I do, I play Psychobilly mainly but will use this bass for classical bluegrass and basically whatever else I can do with it. Also some extra info, it currently has gut strings and the E is a little too big but I’m gonna swap them out for superior bass works deluxe strings. I am going to install a Vic’s model B pickup eventually, the bass is 3/4 size, and I play in a punk band soon. Some photos of the bass are attached bellow and the brand in the inside Says “lark” I think. Thank you!IMG_3872.jpeg
 
Regarding relief (or scoop, or whatever your luthier calls it), you get more of it with higher tension strings by virtue of natural bowing of the neck. So, with lower tension strings, you also get less bowing and less relief.

I tinker, but I wouldn't try dressing fingerboards myself -- pretty complicated, with compound arches and curvatures for each string at tension for the length of the fingerboard. My D- in HS geometry is showing. :D

EDIT: Please note the correcting comment below from @KUNGfuSHERIFF...
 
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Um…no. That’s completely wrong. If the neck is bending, the fingerboard is too thin and needs to be replaced because the fingerboard does a lot of the work of resisting string tension. It’s not helpful when people who don’t know what they’re talking about give bad advice to new players.

OP, if your bridge is warped, you have the option of steaming it like broccoli until the wood is saturated, hot and pliable, then clamping it flat for a week or so until it’s completely dry. Sometimes it works and the bridge stays straight for years, sometimes it quickly turns into a banana again. It helps to get into the habit of using your thumb to push down on the bridge crown while your other hand tunes the string up.
 
Um…no. That’s completely wrong. If the neck is bending, the fingerboard is too thin and needs to be replaced because the fingerboard does a lot of the work of resisting string tension. It’s not helpful when people who don’t know what they’re talking about give bad advice to new players.
Thank you! I appreciate hearing from you directly like this -- even if it's to correct my mistake. I respect your knowledge and experience.
 
Um…no. That’s completely wrong. If the neck is bending, the fingerboard is too thin and needs to be replaced because the fingerboard does a lot of the work of resisting string tension. It’s not helpful when people who don’t know what they’re talking about give bad advice to new players.

OP, if your bridge is warped, you have the option of steaming it like broccoli until the wood is saturated, hot and pliable, then clamping it flat for a week or so until it’s completely dry. Sometimes it works and the bridge stays straight for years, sometimes it quickly turns into a banana again. It helps to get into the habit of using your thumb to push down on the bridge crown while your other hand tunes the string up.
Would it just be better for me to buy an adjustable bridge then at that point