is there...

[kauaiboi]

any tutorials on how to make your own objects?

[Tigerlilley]

heaps. check out simpe or modthesims2

[jrd]

You mean "are there". And not here.
Check some of the tutorials at the SimPE site.

At Sims2Workshop Carrigon also wrote a few newbie help guides.

[Li'l Brudder]

It depends on what program you wish to use to mesh.  I use Blender and love it, but I wouldn't recommend it for beginners.

[kauaiboi]

It depends on what program you wish to use to mesh.  I use Blender and love it, but I wouldn't recommend it for beginners.

what would you recommend?

[Li'l Brudder]

I would recommend Milkshape.

[miros]

Or Wings 3D

[J. M. Pescado]

You'd also have to define "new object". Most likely, in your case, the answer is "no", since you don't even seem to have an idea of what to do.