Beginner Cyclist needs help!

holnrew

If you're a beginner you might need stabilisers. 

sev112

If your bike isn't worth much then seriously decide whether you want to spend loads of money on an EXTREMELY HEAVY D. Lock.  They weigh a ton.  For low value and low risk storage just get a light combination or key lock.
then spend that money on GOOD REAR lights and probably 2 at the same time 
shy away from really bright front ones unless you are on dark unlit roads / canal paths, and if you do get them, take special car to make sure they do not shine at oncoming drivers.  If you blind them then don't be surprised of they then crash into you.

i reiterate, one small flashing red light is not visible on dark wet nights.  That IMHO is the best investment 

helmet needs to fit too.  Not just be adjustable, it needs to fit your head shape so try a few on
decathlon have loads of good value choices

enjoy