I have a pair of the JBL305P. I also have ADAM-A7.

I did not like the bass response of the JBLs as well as the ADAM-A7 but they were much less in cost and I recommend them as being acceptable monitors.

I had a 300watt Gallien Krueger bass amp I gave to a neighbor with a couple of bass speakers and have had top-of-the-line Gallien Krueger amps and cabinets so I have a good idea what real bass should sound like.

I normally will play a bass DI into the DAW through whatever interface I may be using. This is a pretty common way bass gets recorded in any studio.

Any guitar played through software sounds like guitar played through software. I am not saying that is bad or good, just that it does not sound like live bass played through real bass amps and speakers. The advantage of playing a real bass guitar as opposed to playing the bass line on piano for example should be obvious to a competent bass player.

I think it would be pretty easy to overdrive those small JBLs with a bass guitar and harm them. At lower volume levels there is no problem.

I would highly recommend that you buy the best interface you can afford. Buying higher-quality monitor speakers can be acquired as you progress.
Presonus, Native Instruments, Focusrite, and MOTU all make good interfaces.

I have DT 770 Studio headphones that I have used for hundreds of hours to play bass, guitar, piano through at night. There are many good headsets and you should go to a music store and test them out to see what you like.

I really dislike going to Guitar Center but they do have all this gear set up so you can listen and make better buying decisions no matter where you actually buy the stuff from.

I don't think you will be unhappy with the JBL speakers.

Billy

“Amazing! I’ll be working with Jaco Pastorius, Charlie Parker, Art Tatum, and Buddy Rich, and you’re telling me it’s not that great of a gig?
“Well…” Saint Peter, hesitated, “God’s got this girlfriend who thinks she can sing…”