mbp restarts after secs of turning on.. kernel?

Hi guys, my mbp's been put to sleep, at a corner for quite a while now cos i didnt know what to do with it eversince issues started popping up... so i thought i might try it out here to get things solved and hopefully to save it.

Heres the thing.. it started out freezing here and there, color wheel often and lags, programmes are sometimes unresponsive too.. (possible heat issues im guessing?)

And then it started rebooting (color wheel at start up page too) as and when it wishes and sometimes secs after powering up.. and sometimes some kernel codes showed up (which idk whats with the kernel thing) it had to wait for quite a while before able to start it up again and rebooting cycles starts. ):

I had a bloated battery and hence had it removed cos of its due too..

I really hope that theres hope for my mbp to get it running again. Can i get some solutions of whats causing the pronlem and suggestions of what to replace please?? Repair services here aRe quite costly and i dont know which to trust incase its a half s job done.

Hope to get help soon!!!! Really, thank you.