Hey pal,
I would recommend getting more T's maybe something a bit larger maybe 10cm or so that will come out more often

. Slings can take a while to grow and you may loose interest in the slow progress. Look in the classifieds and see if there is something there you like and can afford. if you go this rout as the person selling if the T you are interested in is "beginner friendly" the people here will be honest with you unlike certain pet stores that just want to make a sale.
I tell you what - i got a fairly docile Grammostola rosea ,Chilean Rose its about 9 cm or so i can sell it to you for R500 including tank and so on. This guy is excellent for beginners, this particular guy is fairly active and seems to be pretty passive towards me, as a beginner I would highly recommended this guy or at least something similar. If you want you are more than welcome to come around and check it out.
All the best and happy T'ing