Heya, welcome to GuitarTalk.
If you was in Cpt, I could recommend a few guys for bass lessons (particularly jazz bass) - up int Pta, talk to Keira (https://www.facebook.com/keira.witherkay) - she's a guitar & bass tutor in Pta - while she's mostly kinown for guitaring - she's real good at almost everything ?
On the amp front:
I'm a fan of the v2 Fender Rumble's - plug n play simplicity and reliable. The v2 is quite light and the 100W one is easily loud enough to hang with a jazzy drummer. But they're a tad pricey, even secondhand (+/- 4k).
I also like the TC electronics BG series combo's a lot more power (200w) but still portable - and they got the toneprint thing, which sounds gimmicky but REALLY works if you don't mind tweaking a bit - if you see one for around R4k - they're a decent option too.
The Hartke HD50 is decently priced new (Around R2800 at Harry Green Music) and not a bad 2nd hand option. I'm not a fan of the cheaper ashdown's (they break, often!). The 65w Ibanez Soundwave is also a cheaper 2ndhand option - the guys on our whatsapp group recently found one for R500! But I'd expect to pay R1200-R2000 for a 2ndhand one.