Hi @iamhaslemere welcome to Steemit Community. Have you joined the Newcomers Community ? We have this program where you will get to learn steem ecosystem and get reward along the way Lists of Achievement Tasks,Resources & Materials : Newcomers Resources. If you have completed at least Achievement 4 you can apply for our 500SP Support Program 500SP Minnow Support Program: Curation List - Updated 26/10/2020.
You can join @steemingcurators community too Steemingcurators we help each other grow in Steemit there.

can i click the UPVOTE mostly on what i see is a good content, does it have a limit to upvote? will i be losing something when i just click upvotes more often?

you can check your upvote mana here https://steemworld.org/@iamhaslemere

you still have about 58% Resouce Credit left. If it goes to 0 you will not be able to do anything with your account and have to wait for some time for this RC to recharge back to 100%.

Also, can i UPVOTE on my own Blogs and comments? will it have any points lose or something on my end????

You are free to upvote your own post but this is not generally encouraged in an excessive manner, also with 14SP there is not much upvote value you will get if you self vote your own blog and comments. Your resource credit will drain fast if you frequently upvote and will take some time to recharge back.
My suggestion is to engage more with others, join #thediarygame 1000 DAYS OF STEEM : The Diary Game - Season 2 ends, Season 3..., the easiest way to get started and to get support from steemit curation account while it still last..